Buderus 11S Servicing Manual Download Page 15

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Troubleshooting

Subject to modifications resulting from technical improvements!

Buderus Ltd. • http://www.buderus-domestic.co.uk

Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006

Fig. 12

Fault warning message 4C: F2 fuse malfunction, or exhaust-gas sensor tripped

Flashing

F2 fuse malfunction, or exhaust-gas

sensor tripped

Yes

Connect lead correctly

Remove the casing (page 48)

Check wiring connection of UBA

(page 53)

Fuse (1.25 AT) should be

replaced

page 16

Yes

"reset"

New fault

warning message

Check miniature fuse F2 (page 53)

Miniature fuse F2 OK?

Wiring connection

OK?

Check exhaust-gas sensor

(page 49)

Replace exhaust-gas sensor

(page 49)

page 16

Yes

Exhaust-gas

sensor OK?

Summary of Contents for 11S

Page 1: ...7210 1300 02 2006 GB EN For trade use Please read thoroughly before attempting to diagnose fault Servicing manual Gas wall hung boiler condensing 600 Series 11S 19S 24S 24C GB122...

Page 2: ...ecking and adjusting the gas to air ratio 62 3 1 29 Measuring the ionisation current 63 3 1 30 Replacing the ionisation electrode 63 3 1 31 Checking the three way motorised valve for correct operation...

Page 3: ...atic Burner UBA 1 1 UBA status display Operational condition and error messages appear on the display of the Universal Automatic Burner UBA The message consists of two characters The first character i...

Page 4: ...button Item 4 Boiler flow temperature Item 5 Hot water temperature Item 6 Power adjustment Item 7 Pump overrun switch Item 8 Chimney sweep switch Item 9 11 kW jumper 1 3 Service tool The service tool...

Page 5: ...erval circuit 10 min from burner start up C Waiting for the three way valve and or pump to switch H Standby activated 600 Series 11S 19S 24S 24C ready to provide heat or hot water L Initial safety per...

Page 6: ...at cable loom or damaged wiring page 12 4 Temperatures A Feed sensor above 100 C page 13 C F2 fuse malfunction or exhaust gas sensor tripped page 15 F Safety sensor exceeds 100 C page 17 H Dripping ta...

Page 7: ...C Mains voltage interrupted following a fault warning message page 32 F F3 fuse defect or UBA system error page 33 H Voltage peaks in UBA page 34 L UBA timer error page 35 8 General fault gas pressur...

Page 8: ...display Hot water mode Although the UBA is apparently ready for use situations may arise where a hot water tap is opened and no hot water flows out or flows out for only a short period Troubleshooting...

Page 9: ...that plugs and wiring terminals on the UBA are connected correctly Each time a fault has been rectified push the reset button to unblock the UBA and return it to standby mode Certain troubleshooting t...

Page 10: ...ed in the installation and servicing instructions for signs of airlocks and dirt purge and or clean as required Circulation pump OK Remove the casing page 48 Safety sensor OK Open maintenance shutoff...

Page 11: ...ons for signs of airlocks and dirt purge and or clean as required Circulation pump OK Remove the casing page 48 Safety sensor OK Open maintenance shutoff valves Fill up with water as indicated in the...

Page 12: ...ction at cable loom or damaged wiring Remove the casing page 48 No No Yes reset Replace cable Use the corresponding flow diagram to diagnose and deal with the fault Wiring OK reset Flashing Bad plug i...

Page 13: ...page 48 Open maintenance shutoff valves Fill up with water as indicated in the installation and servicing instruc tions and purge the system of air Open one thermostatic valve Replace circulation pum...

Page 14: ...ed condensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 Fig 11 Continuation of fault warning message 4A Feed sensor above 100 C 17 page 13 16 page 13 A page 46 Fit the casing page 48 reset...

Page 15: ...on or exhaust gas sensor tripped Flashing 4 F2 fuse malfunction or exhaust gas sensor tripped Yes Connect lead correctly Remove the casing page 48 Check wiring connection of UBA page 53 Fuse 1 25 AT s...

Page 16: ...ng message 4C F2 fuse malfunction or exhaust gas sensor tripped 20 page 15 18 page 15 page 46 Fit the casing page 48 reset 600 Series 11S 19S 24S 24C OK No Yes Clean the heat exchanger and burner as i...

Page 17: ...warning message 4F Circulation pump OK Remove the casing page 48 Open maintenance shutoff valves Fill up with water as indicated in the installation and servicing instruc tions and purge the system of...

Page 18: ...ng message 4H Dripping tap Flashing 4 Dripping tap H Yes Please deal with this item No There is constant heat monitoring over a period of 4 hours but the boiler has been heating up for less than 20 mi...

Page 19: ...06 19 Fig 16 Fault warning message 4L Short circuit in safety sensor Flashing 4 Short circuit at safety sensor L Yes Replace cable Remove the casing page 48 Check safety sensor page 55 Replace safety...

Page 20: ...7 Fault warning message 4P Safety sensor loose contact or defect Flashing 4 Safety sensor loose contact or defect Yes Replace cable page 55 Remove the casing page 48 Check safety sensor page 55 Replac...

Page 21: ...02 2006 21 Fig 18 Fault warning message 4U Short circuit in feed sensor Flashing 4 Short circuit in feed sensor Yes Replace cable Remove the casing page 48 Check feed sensor page 56 Replace feed sens...

Page 22: ...6 Fig 19 Fault warning message 4Y Feed sensor loose contact or defective Flashing 4 Feed sensor loose contact or defective Yes Replace cable Remove the casing page 48 Check feed sensor page 56 Replace...

Page 23: ...c co uk Servicing manual for wall mounted condensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 23 Fig 20 Fault warning message 5C 600 Series has switched off after disconnection of diagnosi...

Page 24: ...Gas air ratio OK Remove the casing page 48 Gas connection pressure OK Open gas supply shutoff valve Contact local gas supply utility No No No No Yes Yes Yes reset Measure connection pressure 18 25 mb...

Page 25: ...e or no ionisation message after ignition Yes A No No page 46 No Yes Check fuse F1 page 53 Fuse OK 21 page 24 Fuse 1 25 AT should be replaced Replace ionization electrode page 63 A Yes page 46 Ionizat...

Page 26: ...6A F1 fuse defective or no ionisation message after ignition Yes Replace gas burner assembly page 60 A No No page 46 No Yes Yes Check switching contact of floor thermostat page 53 Switch contact OK Ch...

Page 27: ...ensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 27 Fig 24 Continuation of fault warning message 6A F1 fuse defective or no ionisation message after ignition Replace fan unit page 51 No Plu...

Page 28: ...9S 24S 24C Issued 02 2006 Fig 25 Fault warning message 6C Ionisation message but no flame Yes A No page 46 Check gas burner subassembly page 60 Fit the casing page 48 reset 600 Series 11S 19S 24S 24C...

Page 29: ...the gas connection pressure Gas air ratio OK Open gas valve completely 6 H Flame dies out after main gas valve is opened reset Remove the casing page 48 Put system into chimney sweeper mode page 47 Fi...

Page 30: ...ring warm up phase reset Is the gas supply shutoff valve completely open Remove the casing page 48 Put system into chimney sweep mode page 47 Check gas air injector for correct fitting and possible cl...

Page 31: ...rning message 7A Voltage in UBA too low or too high Flashing Voltage in UBA too low high Contact local energy supply utility Yes on fourth attempt to start up Remove the casing page 48 A No No page 46...

Page 32: ...ted condensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 Fig 29 Fault warning message 7C Mains voltage interrupted following a fault warning message Flashing Mains voltage interrupted follo...

Page 33: ...sage 7F F3 fuse defect or UBA system error Flashing F3 fuse defect or UBA system error F 7 Replace three way valve page 65 A No page 46 No Yes Remove the casing page 48 Is F3 defective Operation OK Fi...

Page 34: ...24C Issued 02 2006 Fig 31 Fault warning message 7H Voltage peaks in UBA Flashing Voltage peaks in UBA Contact electricity supplier and Buderus Customer Service Yes on fourth attempt to start up Remov...

Page 35: ...erus domestic co uk Servicing manual for wall mounted condensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 35 Fig 32 Fault warning message 7L UBA timer error Flashing UBA timer error L 7 Re...

Page 36: ...al switching contact e g temperature monitor for floor heating has been tripped Yes Connect contacts correctly No No Yes New fault warning message 8Y Fit the casing page 48 reset 600 Series 11S 19S 24...

Page 37: ...C Issued 02 2006 37 Fig 34 Fault warning message 9A with any character except P System error Yes on second or third attempt to start up System error 9 Yes on fourth attempt to start up No reset 600 Se...

Page 38: ...600 Series 11S 19S 24S 24C Issued 02 2006 Fig 35 Fault warning message 9C Wiring to KIM connected incorrectly Flashing Incorrect cable connection at UBA or KIM defective C 9 Yes Connections OK No Remo...

Page 39: ...02 2006 39 Fig 36 Fault warning message 9F H P System error UBA defective or KIM defective Flashing Timer error UBA defective F H P 9 At second attempt No reset 600 Series 11S 19S 24S 24C OK B page 46...

Page 40: ...Fig 37 Fault warning message 9L Wiring to gas valve assembly incorrect or loose wiring connections in UBA Flashing Wiring to gas valve assembly incorrect or loose wiring connections in UBA L 9 Yes Con...

Page 41: ...ect or loose wiring connections in UBA U 9 Connections OK No Fit the casing page 48 reset 600 Series 11S 19S 24S 24C OK A page 46 Remove the casing page 48 KIM connected correctly Check wiring connect...

Page 42: ...manual for wall mounted condensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 Fig 39 Fault warning message EP Non compatible UBA installed E P Non compatible UBA installed Yes Fit the casing...

Page 43: ...nction No mains water despite system being ready for operation Yes Replace three way valve page 65 26 No No page 44 No Yes Yes Remove the casing page 48 Is the chimney sweep switch set to 0 Check thre...

Page 44: ...or wall mounted condensing gas boiler 600 Series 11S 19S 24S 24C Issued 02 2006 Fig 41 Continued malfunction No mains water despite system being ready for operation Yes A No page 46 Check mains water...

Page 45: ...system is ready for use Yes Configure connections correctly A No No page 46 Yes Configuration OK Check control unit connection to UBA page 66 Connections in UBA OK Fit the casing page 48 600 Series 11...

Page 46: ...tion despite request for activation and display message indicating that system is ready for use Yes reset No Yes Fit the casing page 48 600 Series 11S 19S 24S 24C OK Correct contact malfunction Check...

Page 47: ...e 3 1 2 Chimney sweep mode Certain troubleshooting tasks must be carried out with the 600 Series 11S 19S 24S 24C in heating mode z Before proceeding open the cover of the second operating level on the...

Page 48: ...s switch to 0 z Loosen the fixing screw fig 46 item 1 z Detach the outer casing z To refit the casing follow the above procedure in reverse order Then return the mains switch to I 3 1 4 Removing and r...

Page 49: ...throughput If throughput is not free the exhaust gas sensor is defective z Replace any exhaust gas sensor found to be defective Ensure you use only genuine Buderus spare parts z If the exhaust gas se...

Page 50: ...e the position of the cable plugs disconnect all cable plugs z Open the mains connection box by loosening the screw z Loosen the four screws and remove the strain relief clamp z Carefully lift the UBA...

Page 51: ...power supply is in order plug the unit in once more z Turn the mains power switch to I z If the fan now fails to run it must be replaced z If the fan runs at only partial load i e effective operation...

Page 52: ...VENT gas combination unit from its bayonet connector and pull upwards to detach fig 57 item 2 z Detach the fan by loosening the 2 x 2 screws on the connection unit z Replace the fan z Refit by followi...

Page 53: ...rosshead screw on UBA housing z Swivel UBA housing downwards z Open the UBA housing z Check miniature fuses fig 60 for correct functioning or carry out visual inspection If defective fit new fuse 1 25...

Page 54: ...orrectly screw the plug back in 3 1 15 Replacing the circulation pump z Disconnect the system from the power supply z Shut the servicing cock z Drain the 600 Series 11S 19S 24S 24C as per the Installa...

Page 55: ...connection z Open servicing cocks 3 1 18 Checking the safety sensor connection lead Check to ensure that all plug in connections on the sensor and UBA are in order Note that an incorrectly inserted p...

Page 56: ...onnection z Open servicing cocks 3 1 21 Checking the feed sensor connection lead Check to ensure that all plug in connections on the sensor and UBA are in order Note that an incorrectly inserted plug...

Page 57: ...2 z Measure resistance take a temperature reading at the thermal pressure gauge tolerance 5 K and compare with the values listed in table 3 If there is any marked mismatch the hot water sensor is def...

Page 58: ...onnection plug and socket connection on cable to hot water mains water sensor z Remove insulation mounting fig 71 item 1 and detach insulation z Pull out the sensor fuses fig 72 z Unscrew hot water ma...

Page 59: ...plug the cable into the UBA housing z Shut the UBA housing z Swivel the UBA housing upwards and screw into place z Connect system to mains power supply 3 1 25 Replacing the hot surface ingitor z Disco...

Page 60: ...s of running time z If the voltage reading is 24 V the control system of the gas burner fitting is in order z When the test is complete set the mains switch to 0 3 1 27 Replacing the gas burner fittin...

Page 61: ...combination unit forward fig 79 item 1 z Remove the CombiVENT gas combination unit from its bayonet connector and pull upwards to detach fig 79 item 2 z Loosen the three screws fig 80 z Screw the air...

Page 62: ...button fig 82 item 2 and keep it pressed until Y is shown on the display z Set the heating capacity controller fig 82 item 4 to 1 z Read the differential pressure The differential pressure pgas pair m...

Page 63: ...Enter the reading on the report form z Disconnect the system from the power supply z Remove the measuring device and restore the plug and socket connection to its original state z Turn the chimney swe...

Page 64: ...torised head is working attach the regulating motor and lock into place by twisting the bayonet connector z Connect the system to the power supply set the mains switch to I and press the reset button...

Page 65: ...torised valve head and remove bayonet connector by twisting anticlockwise z Remove motorised head z Loosen the 3 compression nuts fig 87 z Remove three way valve and fit new unit z Tighten the 3 compr...

Page 66: ...t ERC or RC are correctly connected to 3 and 4 z Terminals 1 and 2 should not be wired in any way The unit is supplied with a dummy connector between terminals 1 and 2 fig 90 The DC voltage at termina...

Page 67: ...era ture control device z Carry out the corresponding adjustment settings on the room temperature control device Fig 90 Checking the controller device connections at the boiler Key to control device c...

Page 68: ...buderus domestic co uk Buderus is a trading name of BBT Thermotechnology UK Ltd Customer Services Technical Product Support Sales Returns Spares Tel 0870 421 5933 Tel 0870 421 5944 Tel 01905 752 640 T...

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