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Service Manual

Bosch IDS 2.0

| 43

Bosch Thermotechnology Corp.

07.2021

Data subject to change

12.3.2 E4 Troubleshooting

LED display output:

Description:

Temperature sensor fault (T3, T4, T5, Th, T3L, TF)

Possible causes:



Temperature sensors failed – shorted or open (common cause)



Wrong wire connections of sensor



Ambient temperature beyond our operation range

Table 30

Procedure:

Figure 17

Restart system

Replace sensor

Yes

Correct the connection

No service required

Yes

Is the control board

wiring correct?

Is the T4 (ambient

temperature) <-4 °F?

Are temp. sensors

(T3/T4/T5/TH/T3L/

Tf) open or did it

short circuit?1

1) See Section 13.4

Summary of Contents for IDS 2.0

Page 1: ...Bosch IDS 2 0 Split System Heat Pump Condensing Units Up to 20 5 SEER 2 3 4 5 Ton Capacity R410A Service Manual ...

Page 2: ...2 Bosch IDS 2 0 Service Manual 07 2021 Bosch Thermotechnology Corp Data subject to change ...

Page 3: ...gs 35 11 4 Check Point Values 36 12 Diagnosis and Troubleshooting 37 12 1 Control Board Component Layout 37 12 1 1 BOVA36 Outdoor Unit Control Board 37 12 1 2 BOVA60 Outdoor Unit Control Board 38 12 1 3 BVA2 0 Indoor Unit Control Board 39 12 2 Fault Code and Limited Condition Descriptions 40 12 3 Fault Codes and Limited Conditions Troubleshooting 42 12 3 1 C3 Troubleshooting 42 12 3 2 E4 Troublesh...

Page 4: ...S after disconnecting power prior to touching electrical components as they may hold a dangerous charge of 380 VDC then verify DC Voltage is less than 42VDC at inverter TEST POINTS P N NOTICE This document is customer property and is to remain with this unit Please return to service information pack upon completion of work These instructions do not cover all variations in systems or provide for ev...

Page 5: ...can result in personal illness or injury or severe equipment damage System contains oil and refrigerant under high pressure Recover refrigerant to relieve pressure before opening system NOTICE INDOORUNITREQUIRED The indoor units must be matched with TXV The model of TXV can be changed according to the system capacity CAUTION GROUNDINGREQUIRED Failure to inspect or use proper service tools may resu...

Page 6: ...ure 2 1 Bosch IDS BVA2 0 Figure 1 B V A 24 W N1 M 20 Efficiency 20 20 SEER Power Supply M 208 230V 1Ph 60Hz Refrigerant N1 R410A Function Type W Wired Controller Nominal Capacity 24 24 1 000BTU H Series A A Series Unit Type V Vertical Air Handler Bosch 36 36 1 000BTU H 48 48 1 000BTU H 60 60 1 000BTU H ...

Page 7: ... IDS BOVA2 0 Figure 2 B OV A 36 H N1 M 20 G Compressor Brand G GMCC Efficiency 20 20 SEER Power Supply M 208 230V 1Ph 60Hz Refrigerant N1 R410A Function Type C Condenser H Heat Pump Nominal Capacity 36 36 1 000BTU H Series A A Series Unit Type OV Discharge Type Bosch D D DC Inverter 60 60 1 000BTU H ...

Page 8: ...chnology Corp Data subject to change 3 Models Part Numbers BoschPartNumber BoschModelNumber 8733952437 BOVA 36HDN1 M20G 8733952438 BOVA 60HDN1 M20G 8733952439 BVA 24WN1 M20 8733952440 BVA 36WN1 M20 8733952441 BVA 48WN1 M20 8733952442 BVA 60WN1 M20 Table 1 ...

Page 9: ...IDE LOW VOLTAGE CONNECTION CIRCUIT BREAKER SWITCH FOR ELECTRIC HEATER ONLY VAPOR LINE CONNECTION COPPER TUBE SWEAT LIQUID LINE CONNECTION COPPER TUBE SWEAT AUXILIARY DRAIN CONNECTION 3 4 FEMALE PIPE THREAD NPT AUXILIARY DRAIN CONNECTION 3 4 FEMALE PIPE THREAD NPT PRIMARY DRAIN CONNECTION 3 4 FEMALE PIPE THREAD NPT H D HIGH VOLTAGE CONNECTION 1 DIA KNOCK OUTS 4 3 8 3 1 8 7 ModelSize DimensionsInch ...

Page 10: ... ALLOW 60 MINIMUM CLEARANCE ALLOW A MINIMUM OF 12 CLEARANCE ON ONE SIDE OF ACCESS PANEL TO A WALL AND A MINIMUM OF 24 ON THE ADJACENT SIDE OF ACCESS PANEL AIR INLET LOUVERED PANELS ALLOW 12 MINIMUM CLEARANCE W H L Model Size Dimensions Inches Heat Pump H in mm W in mm L in mm BOVA 36 24 15 16 633 29 1 8 740 29 1 8 740 BOVA 60 33 3 16 843 29 1 8 740 29 1 8 740 Table 3 ...

Page 11: ...00 13 5 19 24000 10 19000 860 680 BOVA 36HDN1 M20G BMAC2430BNTD BGH96M080B3A 24000 13 5 19 24000 10 19000 840 630 BOVA 36HDN1 M20G BMAC3036ANTD BGH96M060B3A 32200 11 2 17 34000 10 25000 1050 800 BOVA 36HDN1 M20G BMAC3036ANTD BGH96M080B3A 32200 11 2 17 34000 10 25000 1020 800 BOVA 36HDN1 M20G BMAC3036BNTD BGH96M060B3A 33000 11 6 17 5 34200 10 25000 1100 850 BOVA 36HDN1 M20G BMAC3036BNTD BGH96M080B3...

Page 12: ... 208 230 1 60 208 230 1 60 208 230 1 60 208 230 1 60 Minimum Circuit Ampacity 3 3 3 8 5 7 5 7 Max Overcurrent Protection 15 15 15 15 Min Max Volts 172V 270V AirFilter Air Filter Sizes 18 x 20 18 x 20 20 x 22 20 x 22 Weight Net Weight without packaging lbs 119 126 162 170 Gross Weight including packaging lbs 132 139 180 188 Dimensions Unit D x W x H in 21 5 8 x 19 5 8 x 46 1 2 21 5 8 x 19 5 8 x 46 ...

Page 13: ...1 60 Minimum Circuit Ampacity 26 3 38 8 Max Overcurrent Protection 45 60 Max Fuse Size 45 60 Min Max Volts 172V 270V Weight Net Weight without packaging 150 220 Gross Weight including packaging 180 253 Dimensions Unit L x W x H in 29 1 8 x 29 1 8 x 24 15 16 29 1 8 x 29 1 8 x 33 3 16 Outdoor Coil Net face area sq ft Outer Coil 13 6 18 4 Tube diameter in 9 32 7mm 9 32 7mm No of rows 2 2 8 Fins per i...

Page 14: ... 20 2 20 4 20 6 20 8 25 8 26 0 26 3 S T 0 95 1 00 1 00 1 00 0 64 0 89 0 96 1 00 0 40 0 57 0 75 0 92 0 39 0 53 0 66 kW 1 10 1 11 1 13 1 13 1 13 1 14 1 15 1 16 1 16 1 17 1 18 1 19 1 45 1 46 1 48 95 TC 18 3 18 5 18 9 19 1 18 9 19 1 19 3 19 5 20 1 20 4 20 5 20 8 25 7 25 9 26 1 S T 0 95 1 00 1 00 1 00 0 64 0 89 0 96 1 00 0 40 0 57 0 75 0 92 0 39 0 53 0 66 kW 1 33 1 35 1 36 1 36 1 36 1 38 1 39 1 40 1 41...

Page 15: ...1 00 1 00 1 00 1 00 0 66 0 92 1 00 1 00 0 40 0 65 0 90 1 00 0 40 0 64 0 87 kW 1 97 1 99 2 01 2 01 2 01 2 03 2 05 2 07 2 11 2 11 2 11 2 11 2 12 2 12 2 12 1080 15 TC 25 8 26 1 26 7 27 0 26 7 27 0 27 3 27 6 28 6 28 8 29 1 29 4 36 1 36 4 36 6 S T 0 98 1 00 1 00 1 00 0 67 0 90 0 97 1 00 0 39 0 60 0 80 0 99 0 38 0 55 0 71 kW 1 04 1 05 1 06 1 06 1 06 1 07 1 08 1 09 1 09 1 10 1 12 1 13 1 59 1 62 1 64 65 T...

Page 16: ...0 81 0 87 0 95 1 00 0 61 0 78 0 89 0 92 0 40 0 56 0 72 0 87 0 39 0 52 0 65 kW 1 51 1 53 1 54 1 54 1 54 1 56 1 58 1 59 1 60 1 61 1 62 1 64 2 00 2 02 2 04 95 TC 24 3 24 6 25 1 25 4 25 1 25 4 25 7 25 9 26 8 27 1 27 3 27 5 32 8 33 1 33 3 S T 0 81 0 87 0 95 1 00 0 61 0 78 0 89 0 92 0 40 0 56 0 71 0 88 0 39 0 52 0 65 kW 1 82 1 84 1 86 1 86 1 86 1 88 1 90 1 92 1 92 1 94 1 96 1 97 2 43 2 45 2 47 105 TC 24...

Page 17: ...0 89 0 94 0 99 1 00 0 75 1 00 0 96 0 99 0 41 0 75 1 00 1 00 0 43 0 74 1 00 kW 2 03 2 05 2 07 2 07 2 07 2 09 2 11 2 14 2 18 2 18 2 18 2 18 2 18 2 18 2 18 1350 15 TC 34 2 34 6 35 4 35 8 35 4 35 8 36 2 36 5 37 8 38 1 38 5 38 8 45 0 45 3 45 7 S T 0 89 0 93 1 00 1 00 0 64 0 89 1 00 1 00 0 39 0 58 0 78 1 00 0 38 0 54 0 70 kW 1 41 1 43 1 45 1 45 1 45 1 46 1 48 1 49 1 49 1 50 1 52 1 54 2 01 2 03 2 06 65 T...

Page 18: ...0 93 1 00 1 00 0 60 0 81 0 95 1 00 0 39 0 56 0 72 0 88 0 38 0 52 0 65 kW 2 41 2 44 2 46 2 46 2 46 2 49 2 52 2 54 2 55 2 57 2 59 2 62 3 16 3 19 3 22 95 TC 39 7 40 2 41 1 41 5 41 1 41 5 42 0 42 4 43 9 44 3 44 6 45 0 53 0 53 4 53 8 S T 0 89 0 93 1 00 1 00 0 61 0 81 0 95 1 00 0 39 0 56 0 72 0 88 0 38 0 52 0 66 kW 2 90 2 93 2 96 2 96 2 96 2 99 3 02 3 05 3 06 3 09 3 12 3 14 3 77 3 80 3 83 105 TC 39 1 39...

Page 19: ...0 97 1 00 1 00 0 68 1 00 0 96 1 00 0 40 0 68 1 00 1 00 0 41 0 67 1 00 kW 3 37 3 41 3 44 3 44 3 44 3 48 3 51 3 55 3 62 3 62 3 62 3 62 3 64 3 65 3 65 1900 15 TC 47 9 48 5 49 5 50 1 49 5 50 1 50 6 51 2 53 1 53 5 53 8 54 3 64 0 64 4 64 8 S T 0 91 0 96 1 00 1 00 0 64 0 88 0 96 1 00 0 39 0 58 0 78 0 99 0 38 0 54 0 71 kW 2 59 2 62 2 65 2 65 2 65 2 68 2 70 2 73 2 74 2 77 2 79 2 82 3 23 3 26 3 29 65 TC 47 ...

Page 20: ... 0 80 0 85 0 93 1 00 0 59 0 79 0 90 0 95 0 39 0 55 0 71 0 86 0 38 0 51 0 64 kW 2 55 2 58 2 61 2 61 2 61 2 63 2 66 2 69 2 70 2 72 2 74 2 77 3 30 3 33 3 36 95 TC 40 9 41 4 42 3 42 7 42 3 42 7 43 2 43 7 45 2 45 5 46 0 46 3 53 9 54 3 54 7 S T 0 80 0 85 0 93 1 00 0 59 0 79 0 90 0 95 0 39 0 55 0 70 0 86 0 38 0 52 0 65 kW 3 06 3 09 3 13 3 13 3 13 3 16 3 19 3 23 3 23 3 26 3 29 3 32 3 93 3 97 4 00 105 TC 4...

Page 21: ...0 87 0 92 1 00 1 00 0 68 1 00 0 95 1 00 0 40 0 68 1 00 1 00 0 40 0 67 0 99 kW 3 38 3 41 3 45 3 45 3 45 3 49 3 52 3 56 3 63 3 63 3 63 3 63 3 65 3 65 3 65 1880 15 TC 51 0 51 6 52 8 53 3 52 8 53 3 53 9 54 5 56 6 57 0 57 4 57 9 66 6 67 0 67 4 S T 0 75 0 80 1 00 1 00 0 61 0 84 0 90 0 95 0 39 0 57 0 75 0 92 0 38 0 53 0 69 kW 2 69 2 72 2 75 2 75 2 75 2 78 2 81 2 84 2 79 2 85 2 90 2 95 3 51 3 54 3 57 65 T...

Page 22: ...2 2 22 2 22 1 22 1 22 1 22 0 22 0 22 0 22 0 21 0 19 8 18 9 18 5 17 6 kW 0 74 1 00 1 08 1 18 1 29 1 41 1 57 1 69 1 83 1 93 2 11 2 27 2 46 2 45 2 38 2 30 2 24 75 TC 18 2 18 2 18 2 18 2 18 2 18 2 18 2 18 1 18 1 18 1 18 1 18 1 18 0 18 0 18 0 17 1 15 8 kW 0 60 0 82 0 89 0 97 1 08 1 17 1 27 1 37 1 54 1 63 1 75 1 87 1 99 2 15 2 34 2 40 2 33 80 TC 14 4 14 4 14 4 14 4 14 4 14 4 14 4 14 4 14 4 14 4 14 4 14 ...

Page 23: ... 2 30 5 30 5 28 4 27 5 25 6 23 8 22 3 20 7 kW 1 27 1 63 1 72 1 89 2 02 2 17 2 36 2 60 2 83 2 94 3 22 3 12 3 03 2 93 2 85 2 76 2 69 75 TC 26 7 26 7 26 6 26 6 26 6 26 6 26 6 26 2 26 2 26 2 26 2 26 2 26 1 24 2 22 3 20 4 18 9 kW 1 06 1 36 1 46 1 58 1 70 1 86 2 01 2 14 2 34 2 50 2 74 2 95 3 16 3 06 2 97 2 88 2 80 80 TC 21 9 21 9 21 9 21 9 21 9 21 8 21 8 21 7 21 7 21 7 21 5 21 5 21 5 21 5 21 5 20 1 18 6...

Page 24: ...48 2 48 2 48 2 45 6 43 3 42 0 40 1 38 8 36 9 35 1 33 3 kW 1 98 2 46 2 63 2 83 3 07 3 30 3 61 3 91 4 25 4 19 4 40 4 82 4 82 4 70 4 61 4 53 4 36 75 TC 40 9 40 9 40 8 40 8 40 6 40 7 40 7 40 6 40 7 40 6 40 6 40 6 40 1 38 1 36 5 34 5 32 5 kW 1 72 2 13 2 24 2 39 2 56 2 78 3 01 3 27 3 54 3 77 4 12 4 43 4 76 4 81 4 66 4 57 4 38 80 TC 33 7 33 7 33 6 33 6 33 6 33 6 33 5 33 5 33 5 33 5 33 5 33 5 33 4 33 4 33...

Page 25: ...1 4 51 4 48 9 45 8 42 7 41 6 40 6 38 0 36 0 kW 1 99 2 50 2 68 2 91 3 16 3 40 3 63 4 03 4 39 4 76 4 90 5 04 5 09 4 99 4 91 4 80 4 76 75 TC 43 2 43 2 43 2 43 1 43 1 43 1 43 0 42 9 42 8 42 6 42 6 42 6 42 6 40 5 38 8 36 7 34 5 kW 1 71 2 12 2 24 2 40 2 58 2 78 3 04 3 32 3 56 3 82 4 19 4 51 4 90 4 90 4 71 4 56 4 46 80 TC 34 8 34 8 34 8 34 8 34 7 34 7 34 7 34 4 34 7 34 7 34 7 34 2 34 2 34 2 34 2 34 2 33 ...

Page 26: ... to change 8 Layout of Functional Components 8 1 3 Ton Figure 5 PCB Fan motor HPS T3L PT RV Condenser Accumulator Compressor EEV Heat Sink Tf T4 Th PEV T5 Note T3 not shown in ﬁgure but is located on the condenser coil Please reference Table 18 for abbrevia on and parts descrip on ...

Page 27: ...osch Thermotechnology Corp 07 2021 Data subject to change 8 2 5 Ton Figure 6 Fan motor T5 HPS T3 T3L PT RV Condenser Accumulator Compressor EEV Heat sink Tf T4 Th PEV Note Please reference Table 18 for abbrevia on and parts descrip on ...

Page 28: ...Reversing Valve Strainer Strainer EEV T4 Check valve Condenser Coil T3 T5 HPS Pressure Transducer A E H D C J B G F Compressor I Gauge port of heat pump FAN FAN ON Indoor unit Thermostat ON N Th Strainer T3L M PEV L Bi flow Filter Drier P TXV O Outdoor unit High pressure gas High pressure liquid Low pressure Evaporator Coil Refrigerant flow during cooling operation cooling oil return operation def...

Page 29: ...alve Suction Service Valve Accumulator INV FAN Reversing Valve Bi flow Filter Drier EEV T4 Check valve Evaporator Coil T3 T5 HPS Pressure Transducer A E H D C J B G F Compressor I Gauge port of heat pump FAN TXV Condenser Coil FAN ON Indoor unit Thermostat ON N Th PEV T3L P M L O Outdoor unit Strainer Strainer Strainer Refrigerant flow during heating operation heating oil return operation ...

Page 30: ...erature sensor Used for ambient protection and fan control in heating mode and defrost control H EEV Electronic Expansion Valve Fully open during cooling mode and adjusted during heating mode Controlled in heating mode via compressor discharge superheat I CV Check Valve Open during cooling and closed during heating J PT Pressure Transducer Compressor frequency control Electronic Expansion Valve EE...

Page 31: ...perature T4 and the coil temperature T3 is called Delta T After Delta T is achieved and continues for 3 minutes T4 39 F Delta T 18 F T4 30 F Delta T 16 F T4 19 F Delta T 14 F When T4 19 F T3 9 F accumulative compressor run time 80 minutes 2 After Minimum Run Time MRT is achieved MRT is based on outdoor ambient temperature T4 for example MRT is 4 hours when T4 23 F MRT is 2 hours when 23 F T4 42 F ...

Page 32: ...6 2 dip switches Refer to Airﬂow Performance Table in the relevant IDU IOM for reference airﬂow Refer to ﬁgure 12 for dip switches settings If 2 stage thermostat is not available single stage thermostat may be used please refer to Wiring Diagram section for wiring instructions If Y1 and Y2 are jumped the unit will only run in high stage fan speed Anti Cold Air Fan Delay The Anti Cold Air Fan Delay...

Page 33: ...Connect thermostat wiring as shown in wiring diagrams in IOM No HighVoltageWiring 1 Connect high voltage power supply ensuring proper safety precautions are followed 2 Install high voltage disconnect switch 3 Ensure proper grounding on indoor and outdoor units Table 22 11 2 Initial Start up Checklist WARNING This checklist is NOT to be used in place of the Installation Operation and Maintenance Ma...

Page 34: ...t In zoning applications but only as needed as a result of customer expectations and or performance SW4 4 Default is OFF position system uses the default target coil temperatures If dip switch is changed to ON this reduces the target coil temperature by 4 F in cooling and increases target coil temperature by 4 F in heating Reason to change from default Recommended to be used only as needed as a re...

Page 35: ...ip Switch Position Low Fan Speed High Fan Speed Default SW6 1 OFF 1 2 SW6 2 OFF SW6 1 OFF 1 3 Default on 48 air handler model SW6 2 ON SW6 1 ON 2 4 Default on 24 36 60 air handler model SW6 2 OFF SW6 1 ON 3 5 SW6 2 ON Table 25 SW6 3 Default is ON position which turns on the Anti Cold Air Fan Delay function This function utilizes a sensor T2 located on the indoor coil which prevents the blower from...

Page 36: ...rge temp F 6 T6 compressor suction temp F 7 T7 liquid line temp F 8 Tf module temp F 9 Pe evaporating pressure PSI Low suction Pressure 10 Pc condensing pressure PSI High head Pressure 11 Tes target of the evaporating temp only use for cooling mode F 12 Te evaporating temp F 13 Tcs target of the condensing temp only use for heatling mode F 14 Tc condensing temp F 15 Target of the compressor discha...

Page 37: ...valve port 3 Reversing valve port 4 Thermostat wire connections 5 Th sensor port 6 TF sensor port 7 T3 T4 T3L sensor port 8 Pressure transducer port 9 T5 sensor port 10 Reserve 11 EEV port 12 Reserve 13 Reserve 14 High pressure switch port 15 SW2 FORCE BUTTON 16 SW3 CHECK BUTTON 17 Reserve 18 USB 19 J2 Dip SWITCH Select capacity 20 SW5 Dip SWITCH Defrost logic settings 21 SW4 Dip SWITCH Control lo...

Page 38: ...ctions 5 EEV port 6 Th sensor port 7 TF sensor port 8 T3 T4 T3L sensor port 9 Pressure transducer port 10 T5 sensor port 11 Reserve 12 Reserve 13 Reserve 14 High pressure switch port 15 USB port 16 SW2 FORCE BUTTON 17 SW3 CHECK BUTTON 18 J2 Dip SWITCH Select capacity 19 SW5 Dip SWITCH Defrost logic settings 20 SW4 Dip SWITCH Control logic settings 21 Reserve 22 IC20 EEPROM Chip 23 LED 24 IC14 Driv...

Page 39: ...ontrol Board Figure 15 No Function Description 1 SW6 Dipswitches 2 T2 Sensor 3 High Voltage Connection 4 Non replaceable Fuse 5 Indoor Blower Connection 6 Replaceable Fuse 7 Transformer Connection 8 Electric Heat Kit Connection 9 Thermostat Connection 10 Status LED 2 1 3 4 5 6 7 8 9 10 BVA2 0 Indoor unit control board ...

Page 40: ... T5 sensor Wrong connection on control board of T5 Tf T5 sensor failed E9 EEPROM IC20 fault EEPROM IC20 poor contact EEPROM IC20 improperly installed H0 Communication fault in EEPROM IC14 chip Control board failed H8 Pressure transducer PT fault Pressure transducer wiring not secure Pressure transducer failed F P0 Control board is over heated Poor heat dissipation Tf sensor failed Wrong connection...

Page 41: ...unning in standby mode due to high wind PH Low discharge superheat protection Poor heat exchange on coil Fan motor failure Service valves not open TXV EEV filter drier blocked Under charged L0 L9 The IPM module protection Control board failed Compressor failed Abnormal pressure AtL Ambient Temperature Limited Condition Ambient temperature beyond operating range Incorrect O B thermostat setting T4 ...

Page 42: ...ng LED display output C3 Description T3 sensor is not reading correctly in cooling Possible causes Wrong location of T3 sensor common cause Failed T3 sensor sensor reading incorrect value common cause Failed T4 sensor Table 29 Procedure Figure 16 Replace control board Replace T4 sensor Yes No Yes Correct the location Replace T3 sensor No Yes Is the location of T3 sensor wrong Did T3 sensor fail 1 ...

Page 43: ...emperature sensors failed shorted or open common cause Wrong wire connections of sensor Ambient temperature beyond our operation range Table 30 Procedure Figure 17 Restart system Replace sensor Yes No Yes Correct the connection No service required No Yes Is the control board wiring correct Is the T4 ambient temperature 4 F Are temp sensors T3 T4 T5 TH T3L Tf open or did it short circuit 1 No 1 See...

Page 44: ...oard issue Table 31 Procedure Figure 18 Restart system Replace control board Yes No Yes Correct power supply call utility provider Correct power supply call utility provider No Yes Is the high voltage power supply 270V 172V Is the voltage between P N CN3 310VDC No If power supply is between 180 and 210 V System protection code U will be displayed on the LED screen Frequency will be limited to 50 H...

Page 45: ...e 19 Restart system Replace control board Yes No Yes Power off and remove blockage or replace fan blade Power off until severe weather conditions subside No Yes Is the fan blade damaged or is foreign matter blocking the fan Are outdoor weather conditions preventing the fan from operating normally No Yes Secure connection Is ODU fan motor wire CN3 connection to control board secure No Did the contr...

Page 46: ...ation of T5 sensor compressor discharge temp sensor Wrong connection on control board of T5 Tf common cause T5 sensor failed reading incorrectly Table 33 Procedure Figure 20 Restart system Yes No Correct T5 and Tf connections Are T5 and Tf connections at control board correct Yes Correct T5 sensor location Is the location of T5 sensor wrong No Did T5 sensor fail 1 Yes Replace T5 sensor No 1 See Se...

Page 47: ...utput E9 Description EEPROM IC20 fault Possible causes EEPROM IC20 poor contact EEPROM IC20 improperly installed Table 34 Procedure Figure 21 Replace PCB Power off and correct the contact Yes Power off and correct the connection No Yes Is EEPROM IC20 chip improperly installed No Does EEPROM IC20 have poor contact EEPROM IC20 Chip ...

Page 48: ...isplay output H0 Description Communication fault in EEPROM IC14 chip Possible causes Control board failed Table 35 Procedure Figure 22 Replace PCB Power off and correct the contact Yes Power off and correct the connection No Yes Is EEPROM IC14 chip improperly installed No Does EEPROM IC14 have poor contact EEPROM IC14 Chip ...

Page 49: ...ssure transducer PT fault Possible causes Pressure transducer wiring not secure Pressure transducer failed Table 36 Procedure Figure 23 Restart system Replace control board Yes Replace pressure transducer No Yes Did the pressure transducer fail 1 No Yes Secure wiring Is the wiring secure No Did the control board fail 2 1 See Section 13 2 2 See Appendix 1 ...

Page 50: ...mmon cause Outdoor motor failed causing control board to overheat Table 37 Procedure Figure 24 Restart the system Correct T5 and Tf connections Yes No Yes Refer to control board replacement instructions Correct Replace motor No Yes Is there poor heat dissipation Did the outdoor fan motor fail 1 No Are T5 and Tf connections at control board correct Replace Tf sensor Yes No Did the Tf sensor fail 2 ...

Page 51: ...ure cooling mode outdoor fan heating mode indoor fan Service valves not open TXV EEV filter drier blocked Over charged Table 38 Procedure Figure 25 Are you running in force mode Yes Is there still a fault code Is ambient temperature 120F No Yes Quit force mode No Yes Is the system overcharged Yes Follow IOM to adjust refrigerant No Did the high pressure switch fail 2 Yes Replace HPS No Restart sys...

Page 52: ...ode outdoor fan Service valves not open TXV EEV filter drier blocked Under charged Table 39 Procedure Figure 26 P2 occurs 5 times in 100 minutes Yes Yes H5 displayed hard lockout No P2 error code System hard shut down Power on unit Is there still a fault code displayed No No service required Is there still low pressure Yes Is the system undercharged Yes Follow IOM to adjust refrigerant No Did the ...

Page 53: ...Service valves not open TXV EEV filter drier blocked Over charged Control board or compressor issue Table 40 Procedure Figure 27 Are you running in force mode Yes Yes Is there still a fault code Is ambient temperature 120F No Yes Quit force mode No Yes Is the system overcharged Yes Follow IOM to adjust refrigerant No Did the high pressure switch fail 2 Yes Replace HPS No Restart system Check for a...

Page 54: ... Fan motor failure cooling mode outdoor fan heating mode indoor fan Service valves not open TXV EEV filter drier blocked Over charged Table 41 Procedure Figure 28 Are you running in force mode Yes Yes Is there still a fault code Is ambient temperature 120F No Yes Quit force mode No Yes If the system is overcharged Yes Follow IOM to adjust refrigerant No Did T5 sensor fail 2 Yes Replace T5 No Resta...

Page 55: ...Fan motor failure cooling mode outdoor fan Service valves not open TXV EEV filter drier blocked Over charged Table 42 Procedure Figure 29 Are you running in force mode Yes Yes Is there still a fault code Is ambient temperature 120F No Yes Quit force mode No Yes Is the system is overcharged Yes Follow IOM to adjust refrigerant No Did T3 sensor fail 2 Yes Replace T3 No Restart system Check for abnor...

Page 56: ...tion DC outdoor fan motor protection Possible causes Severe weather fan running in standby mode due to high wind Table 43 Procedure Figure 30 Restart System Replace motor Yes Power off until severe weather conditions subside No Yes Are outdoor weather conditions preventing the fan from operating normally No Did the motor fail 1 1 See Section 13 6 ...

Page 57: ...failure cooling mode indoor fan heating mode outdoor fan Service valves not open TXV EEV filter drier blocked Under charged Table 44 Procedure Figure 31 Are you running in force mode Yes Yes Is there still a fault code Is ambient temperature 120F No Yes Quit force mode No Yes Is the system under charged Yes Follow IOM to adjust refrigerant No Did T3 T5 sensor fail2 Yes Replace T3 T5 No Restart sys...

Page 58: ...mpressor Yes No Yes Correct power supply Remove blockage No Yes Is the power supply stable Is there any blockage in the refrigerant pipe No Yes Open the service valves Are the service valves closed No Is there any abnormal noise from the compressor Check the refrigerant charge refer to IOM Yes No Does the unit run normally for at least 1 hour Power off and wait 3 minutes before powering on Replace...

Page 59: ...e beyond operating range Incorrect O B thermostat setting T4 sensor fault Table 46 Procedure Figure 33 Restart system Replace T4 sensor Yes No Yes No service required Wait for temperature to be within range Correct thermostat setting No Yes Is the ambient temperature beyond operating range 1 Is the thermostat set to energize O B in heating mode No Did the T4 sensor fail 2 1 Cooling 15 125 F Heatin...

Page 60: ...ard failure Table 47 Procedure Figure 34 Replace control board Refer to wiring diagram on the manual and correct it Yes No Yes Power off and wait at least 3 minutes before powering on Make sure power supply is within normal 172V 270V range No Yes Is the Input voltage supplied and removed frequently within 3 min Is the power supply beyond the normal 172V 270V range No Is the wiring incorrect Replac...

Page 61: ...at wire connection replace the thermostat No Yes Is there 18 28VAC and 0VDC between Y C and B C at the outdoor unit Connect the compressor wire Yes No Is the compressor wire disconnected Refer to Appendix 1 Correct power supply No Yes Is there 230VAC power at high voltage terminal If your unit is not starting it may be due to a designed delay Check Notes 1 3 1 If high voltage power to the unit is ...

Page 62: ...ut the unit is running Possible causes Unit improperly sized System running in limited condition Abnormal pressure under charged failed TXV EEV poor heat exchange Table 49 Procedure Figure 36 Restart System No service required No Yes Check if system is running in limited condition Follow Section 13 1 to check abnormal pressure Yes Check if there is abnormal pressure No Confirm sizing via load calc...

Page 63: ... follow local codes No Yes Was ductwork installed properly Confirm sizing via load calculation Is the unit sized correctly for the application Yes No Refer to IOM No Yes Is the system properly charged Yes Is there still poor dehumidification No service required No Change SW4 4 to on position on outdoor board Set indoor fan to lower speed using SW6 1 SW6 2 on indoor board Yes Is there still poor de...

Page 64: ...es Follow section 13 6 to check ODU motor No Fix clearances refer to IOM Yes Clean indoor coil Yes No Fix clearances refer to IOM Yes Clean air filter Switch between cooling and heating several times Does the problem still persist Yes Switch between cooling and heating several times Does the problem still persist Is there blockage in the bi flow filter drier 3 Follow section 13 7 to check ODU moto...

Page 65: ...ite and Black wires at the CN16 on the control board Write down value to reference later Replace pressure transducer Press check point button on the outdoor control board to check suction pressure Cooling check point 9 Heating check point 10 Write down value for later reference Measure DC voltage between Red and Black wires at the CN16 on the control board Use graph to determine pressure value bas...

Page 66: ...g noise when heating mode begins No Yes Is the voltage between Red wire GND 12V DC No Replace control board Yes Restart system Restart unit give a call for heat Is the voltage between White Yellow Orange Blue GND 12V DC No Replace EEV Are there signs of abnormal high low pressure Follow section 13 1 to check for abnormal pressure No Yes No service required GND ...

Page 67: ...asure resistance at wiring harness Is the corresponding temperature from the resistance value chart 15 F from check point data No Satisfy tstat and wait in standby mode for 10 15 minutes Press check button to get T3 T4 T5 Th T3L Tf temperature Write down temp value s for later reference Temperature Sensor Locations If you do not wait 10 15 minutes your temperature reference value will be incorrect...

Page 68: ...to control board correct Yes No Correct according to wiring diagram Is resistance 1Ω Yes No Is there an active error code Yes Refer to Section 13 1 to check for abnormal pressure No HPS is functioning properly No service required Power off unit at breaker Unplug HPS from control board and measure resistance at wiring harness HPS Location Replace HPS ...

Page 69: ...Yes Power off the unit at breaker wait 3 minutes Restart system give system a call for heating cooling Unplug the wiring harness for the outdoor blower motor from the control board at CN3 Measure the resistance between the pins on the wiring harness refer to Table 1 Measure DC voltage between 15V N pins White Black wire is the voltage 14 18V DC Replace control board Measure DC voltage between VSP ...

Page 70: ...ction or power supply Replace transformer Yes No Is there 230V AC power supply Is there 18 28V AC between CN33 terminals on IDU control board Yes Is there 18 28V AC between R C terminals on IDU control board Fix low voltage wiring replace the thermostat No Yes 28V AC betweenY1 C terminals on IDU control board Replace the control board No Yes Is the LED on the indoor board ON or flashing Replace mo...

Page 71: ...igerant charge according to IOM No Is the refrigerant charge correct Yes Replace compressor Follow fault code specific troubleshooting steps Yes No Is there an active fault code Does compressor appear to be running properly i e no abnormal noise Yes No service required No Correct power supply call utility provider No Is the power supply 172V 270V Is there 24VAC between Y C on control board Fix the...

Page 72: ...efrigerant is being adjusted correctly refer to IOM Adjust charge according to IOM Are SH and SC in Range A or B in Table Yes No service required No Yes Is there a blockage on the air filter Yes Remove blockage clean filter or replace filter Are the blower motor speed settings correct Refer to airflow performance chart in IOM No Change blower fan speeds through SW6 1 SW6 2 dip switches Push checkp...

Page 73: ... control board Power off unit No Did the ODU motor fail 1 Replace ODU motor Yes Replace control board refer to instructions included with spare board No Did the compressor fail 2 Replace compressor Yes Power off unit Did the fuse blow on the outdoor board No service required No Yes Fuse Location IDS 2 0 3T ODU board IDS 2 0 5T ODU board Fuse Location Outdoor Board Fuse 1 See Section 13 6 2 See Sec...

Page 74: ...thermostat wiring No Replace fuse 1 Restart the system Did fuse 1 blow on the indoor board No service required No Yes Power off unit Yes Check if the resistance between CN39 Ground 1MΩ Correct thermostat wiring No Replace indoor control board Restart the system Did fuse 2 blow on the indoor board No service required No Yes Fuse 1 Type 32V 3A Fuse 2 Type 230V 3 15A Function Protect control board ID...

Page 75: ...NG ELECTRICALHAZARD380VOLTSDC Failure to follow this warning could result in property damage severe personal injury or death WAIT THREE 3 MINUTES after disconnecting power prior to touching electrical components as they may hold a dangerous charge of 380 VDC then verify DC Voltage is less than 42VDC at inverter TEST POINTS P N GR W BR V BK U WHITE BLUE ...

Page 76: ... voltage CN3 P N 370 385V DC When compressor starts LED light LED 1 2 3 Light or ﬂash When there is call from thermostat Reversing valve RV CN12 Light or ﬂash When there is B call from thermostat CCH Crank Case Heater CN8 24 36V AC At initial power on long period in standby mode see IOM PEV Pressure Equalization Valve CN17 172 270V AC At initial power on start up sequence EEV Electronic Expansion ...

Page 77: ...Service Manual Bosch IDS 2 0 77 Bosch Thermotechnology Corp 07 2021 Data subject to change Appendix 2 Indoor Unit Control Board Figure 50 ...

Page 78: ...at LED light LED 4 Light or ﬂash When there is high voltage power to unit Electric heat CN6 W1 C W2 C 172 270V AC When there is a call for electric heat Low voltage power supply to board CN33 18V 30V AC When there is high voltage power to unit Indoor blower motor CN39 COM CN35 1 2 3 4 5 C 230V AC 18 30V AC When there is high voltage power to unit When the compressor is running Table 52 Indoor Boar...

Page 79: ...Service Manual Bosch IDS 2 0 79 Bosch Thermotechnology Corp 07 2021 Data subject to change ...

Page 80: ...United States and Canada Bosch Thermotechnology Corp 65 Grove St Watertown MA 02472 Tel 866 642 3198 Fax 603 965 7581 www bosch thermotechnology us BTC 761702111 A 07 2021 ...

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