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DOMETIC® RM7030/RM7732

Refrigerators

DIAGNOSTIC SERVICE MANUAL

5.2

THERMISTOR

RM7030 (Prod. No. 921890401) and RM7732

To determine if the temperature sensor is functioning

properly, perform the following test.
Remove the cover from the lower circuit board. Discon-

nect the thermistor harness from the P2, 2-pin terminal

on the lower circuit board. Place thermistor in a glass of

ice water. Wait 2 to 3 minutes. Using an ohm meter,

place a probe on each terminal point. You should get a

reading of approximately 7,000 to 10,000 ohms. Normal

failure for this type of device is to have a very high

resistance. A defective thermistor could cause an over-

cooling condition on all modes.

5.3

THERMISTOR ADJUSTER

RM7030 (Product No. 921890401) and RM7732

The thermistor adjuster is a resistor-type component

that attaches between the thermistor and the lower

board. Its function is to allow the refrigerator to reach

temperatures below the normal 46° to 35°F. range

(setting 1 through 5 on upper circuit board).
To determine if the thermistor adjuster is operating

properly, do an ohms resistance check across the

terminals. Proper ohms reading is approximately 23,200

ohms ± 10%.

5.4

SOLENOID VALVE

A. RM7030 (Product No. 921890201 & 921890301)

The solenoid valve assembly is a safety valve as well as

a gas flow valve. When the AES selects LP gas opera-

tion, DC volts are sent to the solenoid coil which opens

the internal valve.
Check the solenoid coil with a properly

calibrated ohm meter. Remove the

connector from the solenoid

and measure the resis-

tance across the upper

and lower terminals. The

proper reading would be

20 ohms with a toler-

ance range of ten

percent. Once flame is

lit, the thermocouple

produces the voltage to keep

the valve open. If for any reason the thermocouple does

not provide enough current to the valve, it will close,

stopping the flow of gas. To check this portion of the

solenoid valve assembly, verify the thermocouple is

good (see Sec. 7.3A), the tip is clean and the receptacle

in the solenoid valve assembly is clean. If the thermo-

couple checks good, then replace the solenoid valve

assembly.

NOTE

: If the solenoid ohms check shows an open coil,

the refrigerator will not operate on any mode.

THERMISTOR
ADJUSTER

TO THERMISTOR

NOTE

: Dometic refrigerators do not come equipped with a

thermistor adjuster. This is an add-on component.

THERMISTOR

ADJUSTER

TO THERMISTOR

B. RM7030 (Product No. 921890401) and RM7732

When the refrigerator selects LP gas operation, DC

volts are sent to the solenoid coil which opens the

internal valve.

Check the solenoid coil with a properly calibrated ohm

meter. Remove the connector from the solenoid and

measure the resistance across the terminals. The

proper reading would be 49 ohms with a tolerance

range of ten percent.

Thermistor
unplugged
from PC
Board

All manuals and user guides at all-guides.com

Содержание RM7030

Страница 1: ...ditions Provided is a diagnostic chart leading a qualified mechanic into the service manual pages to locate and solve symptoms which may occur Dometic has continued its commitment in providing service people with this the most up to date information about servicing Dometic RV accessories form No 3 106938 008 2 96 Replaces OS1 684 All manuals and user guides at all guides com a l l g u i d e s c o ...

Страница 2: ...SECTION 5 DC COMPONENTS 5 1 Thermostat RM7030 Prod No 921890201 921890301 9 5 2 Thermistor RM7030 Prod No 921890401 RM7732 10 5 3 Thermistor Adjuster RM7030 Prod No 921890401 RM7732 10 5 4 Solenoid Valve 10 5 5 Igniter 11 5 6 High Voltage Cable 11 5 7 Fuses 12 5 8 Upper Circuit Board 12 5 9 Lower Circuit Board 15 5 10 Door Switch 17 5 11 Electrode 18 5 12 Climate Control Heater 18 SECTION 6 LP GAS...

Страница 3: ... Unit 27 9 7 Food Storage 27 9 8 High Humidity 27 9 9 Interior Liner Seal to Frame 28 SECTION 10 ICE MAKER Ice Maker Operation 29 SECTION11 ICE MAKER COMPONENTS 11 1 Mold Heater 29 11 2 Ice Ejector 29 11 3 Mold Thermostat 29 11 4 Shutoff Arm 30 11 5 Mold Switches 30 11 6 Timing Motor 30 11 7 Water Valve 30 11 8 Ice Maker Assembly 31 SECTION 12 ICE MAKER OTHER 12 1 Water Fill Adjustment 34 12 2 Wir...

Страница 4: ...o 921890201 921890301 SYMPTOM CAUSE REFER TO STEP Operation 1 1 A DC Volts 4 A Fuse 5 7 A Wiring 8 1 8 2 Upper Circuit Board 5 8 A Lower Circuit Board 5 9 A D Operation 1 1 A Thermostat 5 1 Upper Circuit Board 5 8 A Solenoid 5 4 A Wiring 8 2 Lower Circuit Board 5 9 B C D DC Volts 4 A Wiring 8 2 Upper Circuit Board 5 8 B through I Lower Circuit Board 5 9 D Operation 1 1 A AC Volts 2 Heating Element...

Страница 5: ...ltage Cable 5 6 A Electrode 5 11 Wiring 8 2 LP Gas 6 Manual Gas Valve 7 1 Solenoid 5 4 A Orifice 7 2 Burner 7 4 Wiring 8 2 Thermocouple 7 3 A Wiring 8 2 Door Switch 5 10 Door Position 9 4 Food Storage 9 7 Interior Liner to Frame 9 9 High Humidity 9 8 Air Leaks 9 3 Interior Liner to Frame 9 9 High Humidity 9 8 Air Leaks 9 3 Climate Control Heater 5 12 Operation 1 1B or 1 2 DC Volts 4 B Fuse 5 7 B W...

Страница 6: ...de 5 11 Solenoid 5 4 B Upper Circuit Board 5 8 J Wiring 8 2 Lower Circuit Board 5 9 E G Ventilation 9 2 Leveling 9 1 Ambient Temperature 9 5 Air Leaks 9 3 Thermistor 5 2 Cooling Unit 9 6 Thermistor Adjuster 5 3 AC Volts 2 Heating Element 3 Lower Circuit Board 5 9 E F LP Gas 6 Orifice 7 2 Flue Baffle 7 5 Flue Tube 7 7 Flue Cap RM7030 Only 7 6 Burner 7 4 Lower Circuit Board 5 9 E G Thermistor 5 2 Th...

Страница 7: ...10 Door Position 9 4 Food Storage 9 7 Interior Liner to Frame 9 9 High Humidity 9 8 Air Leaks 9 3 Interior Liner to Frame 9 9 High Humidity 9 8 Air leaks 9 3 Climate Control Heater 5 12 Operation 10 Arm in UP Position 11 4 AC Voltage 2 Water Valve 11 7 Ice Maker Cycle 11 8 Blades frozen in ice 12 1 AC Voltage 2 Water Valve 11 7 Ice Maker Cycle 11 8 Shutoff Arm 11 4 Operation 10 Mold Thermostat 11 ...

Страница 8: ...LP GAS DELAY MODE When the vehicle engine is turned off the AES system initiates a delay cycle which prevents the refrigerator from operating on LP gas for 25 minutes The purpose of the delay is to avoid having a gas flame burning dur ing a refueling stop at a gas station see WARNING If the vehicle engine is restarted during this delay pe riod the LP gas operation will not start until the delay pe...

Страница 9: ...rator the AES control system is designed to select this mode whenever it is available The only exception to this is when push button B LP gas only mode is selected The 120 volt heating elements attached to the boiler provide the heat necessary to operate the cooling system The thermo stat controls the power ON and OFF to the elements and maintains the desired temperature LOW VOLTAGE MONITOR The AE...

Страница 10: ...refrigerator controls both the gas and electric operation thereby eliminating the necessity of resetting each time a different energy source is employed After the initial start up the thermostat should be moved from COLDEST to the desired temperature setting usually about mid setting STANDBY MODE OF OPERATION This control system contains a feature where it will continue to operate the cooling syst...

Страница 11: ...mode indica tor lamp C will be illuminated This mode provides LP gas operation only The control system will activate the ignition system and will attempt to light the burner for a period of approximately 45 seconds If unsuccessful the CHECK indicator lamp D will illuminate and the GAS mode indicator lamp C will turn off To restart GAS operation press the main power ON OFF button 1 to the OFF and t...

Страница 12: ...d Maximum fuse size 5 amps With the refrigerator operating on AC or gas mode if voltage to the refrigerator slowly drops to or below 9 5 volts DC the gas flame will come on and will not be thermostatically controlled Low DC volts below 9 5 could cause over cooling B RM7030 Prod No 921890401 RM7732 For the refrigerator to operate on any mode DC voltage must be supplied to the terminals at the rear ...

Страница 13: ... opera tion DC volts are sent to the solenoid coil which opens the internal valve Check the solenoid coil with a properly calibrated ohm meter Remove the connector from the solenoid and measure the resis tance across the upper and lower terminals The proper reading would be 20 ohms with a toler ance range of ten percent Once flame is lit the thermocouple produces the voltage to keep the valve open...

Страница 14: ...If a spark is not produced within 10 seconds the gas flame warning lamp will illumi nate If spark is produced it will take 3 minutes for lamp to illuminate If all of the previous checks are correct the igniter is good do not replace B RM7030 Product No 921890401 and RM7732 The igniter is an electronic device that produces high voltage to create a spark at the burner only on gas mode First verify p...

Страница 15: ...ower circuit board With the switch in the ON position CONTINUITY should be indicated be tween the orange terminal to the yellow terminal on the 10 pin connector ORANGE YELLOW 10 PIN CONTINUITY should be indicated between the brown terminal to the red terminal on the 10 pin connector BROWN RED 10 PIN YELLOW GREEN 10 PIN RED BLUE 10 Pin 7 Pin NO continuity should be indicated between the yellow term...

Страница 16: ...OVED from the lower circuit board and the ON OFF switch turned to ON BROWN BROWN 10 Pin 7 Pin BLACK BLUE 7 Pin With the gas function switch manually depressed CONTI NUITY should be indicated between the violet terminal on the 10 pin connector to the blue terminal on the 7 pin connector With the gas function switch NOT de pressed A reading wouldNOT be indicated NOTE If the check on gas function swi...

Страница 17: ...k on gas mode lamp and switch is not correct verify the wire harness has continuity If wire harness is good replace the upper circuit board YELLOW BROWN 10 Pin 7 Pin BROWN 10 Pin 7 Pin GREEN I GAS FLAME WARNING LAMP NOTE The following checks should be made on the upper circuit board and harness assemblyBEFORE replacing the upper circuit board or wiring harness The checks are to be done with the wi...

Страница 18: ...n the lower circuit board The manual test sequence is as follows Position 1 Idle Position all loads off Position 2 Activate AC Heater Check for AC volts at terminals J7 and J8 Position 3 Activate Gas Solenoid Check for DC volts at Gas Solenoid white wire and yellow wire Position 4 Idle position All loads OFF Position 5 Activate spark ignition system Check for DC volts to terminal of igniter and gr...

Страница 19: ...tive lead from meter to the blue terminal on the 7 pin connector negative lead from meter A voltage reading indi cates the circuit board is good If no voltage is present replace the circuit board NOTE Before changing the circuit board be sure all troubleshooting steps have been followed BROWN BLUE 10 Pin 7 Pin RM7030 Product No 921890401 RM7732 E DC VOLT ALL TESTS ARE TO BE DONE WITH THE REFRIGERA...

Страница 20: ... To check the flame sense circuit of the lower circuit board operate the refrigerator on GAS mode then measure the millivolts between J3 terminal and the other wire connection from the thermocouple The millivolt meter should read between 25 to 35 milli volts with the gas flame burning Next turn the manual shutoff valve to OFF and watch the millivolt reading as it drops Note the millivolt reading w...

Страница 21: ...he wires and do a continuity check In the OFF position there should be no continuity In the ON position there should be a continuity reading ELECTRODE TIP 3 16 BURNER To check the heater itself do an ohms resistance reading on the heater wire by using a properly cali brated ohm meter The proper ohms reading is 34 ohms 10 The approximate amp draw is less than 5 1 2 amp NOTE The climate control will...

Страница 22: ...utoff valve is where the incoming LP gas supply is attached To check the shutoff valve remove and inspect for any obstructions The valve must be turned to ON before any gas operation can occur MANUAL GAS Shutoff VALVE RM7030 Product No 921890201 921890301 RM7030 Product No 921890401 and RM7732 All manuals and user guides at all guides com ...

Страница 23: ...h to the thermocouple Next supply flame to tip of the thermocouple for a few moments while depressing the safety valve Remove the flame and release the safety valve The valve should hold for at least 30 seconds If it does not hold the safety valve open for 30 seconds replace the thermocouple If it does hold for 30 seconds or more the thermocouple is good do not replace it NOTE Be sure the tip on t...

Страница 24: ...tube becomes coated with scale or residue from combustion of LP gas the efficiency of gas operation decreases NOTE After cleaning be sure to reinstall the flue baffle and flue cap FLUE CAP FLUE TUBE SECTION 8 WIRING 8 1 EXTERNAL WIRING A 120 Volts AC Connection The refrigerator is equipped with a three prong grounded plug for protection against shock hazards and should be plugged directly into a p...

Страница 25: ...22 DOMETIC RM7030 RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL TYPICAL WIRING DIAGRAM FOR RM7030 PRODUCT NO 921890201 921890301 All manuals and user guides at all guides com ...

Страница 26: ...2 2 WHITE YELLOW BLUE T T T 1 120 VOLTS AC A B CIRCUIT BOARD POWER CIRCUIT BOARD DISPLAY D C GAS VALVE THERMISTOR ELECTRODE G THERMOCOUPLE REIGNITER F E K L ABSORPTION UNIT SWITCH TERMINAL BLOCK TERMINAL STRIP I J RETAINER FOR BURNER H N HEATER 120VAC P O FUSE 5A FUSE 3A SWITCH HEATING CABLE R Q M LIGHT U RETAINER FOR TERMINAL BLOCK TERMINAL BLOCK S T CIRCUIT BOARD POWER 5 6 GREY BROWN 7 BLUE GREE...

Страница 27: ...24 DOMETIC RM7030 RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL RM7732 TYPICAL WIRING DIAGRAM All manuals and user guides at all guides com ...

Страница 28: ...tion there should be as little open space as possible surrounding the sides and top of the refrigerator to achieve proper air flow All potential dead air pockets should be blocked or baffled to ensure that heat won t be trapped in these spaces and reduce efficiency NOTE Refrigerators should be installed in accordance with appropriate installation instructions received with the refrigerator 9 3 AIR...

Страница 29: ...ates as shown in FIG 7 B Secure the refrigerator and the lower front strip with two screws One screw through each hinge See FIG 8 STEP 2 Install the two screws in the top frame A The top decoration panel must be removed from the refrigerator before the screws can be in stalled Open refrigerator door and gently push the tabs out of the hole in the hinge with flat blade screwdriver See FIG 9 FIG 7 F...

Страница 30: ...meter in one of the containers of water Next supply 115 volts directly to the AC heating ele ments and operate for at least 12 hours Then check the temperature on the thermometer It should be at 45 degrees or lower depending on test conditions see Sec 9 2 and 9 5 If so the cooling unit is good If the temperature of the water is above 45 degrees replace the cooling unit 9 7 FOOD STORAGE Proper refr...

Страница 31: ... the cabinet and slide the refrigerator out approximately 2 4 inches Clean the metal frame and foil backed insulation around the refrigerator Apply a foil backed adhesive tape to the joint between outer frame and foil backed refrigerator insulation Refer to illustration top of page 22 Make sure the refrigerator is dry and that the surface temperatures are above 50 F Use a clear silicon caulking co...

Страница 32: ... first container of ice cubes should be dumped if the water system has been winterized or not used for several weeks DOWNPOSITION ICELEVEL BAIL ARM SECTION 11 ICE MAKER COMPONENTS 11 1 MOLD HEATER The mold heater uses 165 watts to thaw the ice free from the mold It is wired in series with the thermostat which also acts as a safety device With power to the appli ance off check for resistance be twe...

Страница 33: ...T VIEW MOTOR MOUNTING PLATE TIMING CAM WATER VALVE SWITCH HOLDING SWITCH 11 6 TIMING MOTOR This is a low wattage stall type motor which is geared to the timing cam and ice ejector It is a one RPM motor To check the motor disconnect power to the appliance and test for continuity between the two leads If you DO NOT have continuity replace the motor If you have continuity and the motor runs DO NOT re...

Страница 34: ... problem was in the wiring or the unit itself OPERATION While the operation of the ice maker is fairly simple an understanding of its cycle is necessary for the service technician to diagnose specific problems The following series of electrical schematics on the following pages will show a typical cycle and the positions of various components during the cycle the mold and its contents the ejector ...

Страница 35: ...32 DOMETIC RM7030 RM7732 Refrigerators DIAGNOSTIC SERVICE MANUAL All manuals and user guides at all guides com ...

Страница 36: ...33 DIAGNOSTIC SERVICE MANUAL DOMETIC RM7030 RM7732 Refrigerators All manuals and user guides at all guides com a l l g u i d e s c o m ...

Страница 37: ...vel in the appliance Next ensure that the appliance is installed level in the RV If there is still water overflow adjustment of the water fill screw is necessary Locate the screw on the ice maker assembly Turn the screw as necessary toward the or side One full turn of the screw will make an 18cc change in the amount of water DO NOT turn the screw more than one full turn at a time If the water leve...

Страница 38: ... water pressure in the water supply line must be between 15 lbs PSI and 125 lbs PSI Lower water pressure water turned off or obstructions or air in the water line can cause low or no ice produc tion First check to see that the water supply is fully turned on Visually check the line for kinks etc which might obstruct the flow of water To remove trapped air loosen the connection at the water solenoi...

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