Information Gathering - Atwood HE-0601 Service Manual

Temperature Setting Setpoints
There is a high temperature TURN ON setpoint and a low temperature TURNOFF setpoint associated with each
temperature setting. The corresponding voltage at the input pin (J10-1) is listed for each temperature point.
This results in an average temperature for each setting given in the small table on the right. Please note that
this is the average temperature for the FIN - the average CABINET AIR temperature will be approximately 6-8
degrees warmer than the FIN temperature.
Condition
Poor Cooling
Poor Cooling
HE-0601
HE-0801
Troubleshooting Guide
Solution

INFORMATION GATHERING

First – we need to define what is meant by "poor cooling".
1) What are the outside ambient conditions? Direct sunlight on vehicle?
2) What are the temperatures in the freezer air and the cabinet air?
3) Is there reported frost buildup in cabinet or freezer?
4) Is the cabinet level?
5) What is power source? Does problem happen with AC and GAS?
6) Is there evidence of "frosted elbow" (ie cooling not being used up)
7) Is there adequate ventilation? (ie, no blockages, etc)
Verify: In AC mode, verify AC heater is energized with 2.7amps
Verify : In GAS mode, that burner is being ignited and flame has good
shape and color
Next - attempt to get accurate temp data
1) Suggest running cabinet overnight with thermometers placed
2) Get thermocouple data if possible
3) Have dealers/service centers run cabinet outside of RV overnight
1) Refrigerators perform poorly in 100-110˚F;especially in direct sunlight
These refrigerators may perform normally in 90˚F
2) Door gasket leakage can lead to abnormal high internal temperatures
3) Leakage generally caused by door mis-alignment or poor gaskets
4) Off level cabinets inhibit good absorber/condenser function (3˚ angle)
5) If one power source is worse – focus on that power source
6) Suggests poor evaporator tube contact in freezer and/or cabinet fin
7) Poor ventilation directly affects cooling performance
8) AC heater may not be delivering full power (ie damaged, open circuit)
8a) Incoming AC power may be below 110VAC (90-100 VAC problematic)
9) Gas pressure may not be 11"wc; burner may be misaligned if the
flame wicks up along the side of the flue
GAS ABSORPTION
RV REFRIGERATORS