Operating instructions

TM 11574A-OI
3-57
(2) Refrigeration System.
Step Probable Cause Remedy
1 Abnormal pressures. Refer to section 3-11g.
If fault is not corrected proceed to step 2.
2 Controller malfunction. Refer to section 3-11i.
If fault is not corrected proceed to step 3.
3 Evaporator fan or motor defective. Refer to section 3-10b(12).
If fault is not corrected proceed to step 4.
4 Suction modulation valve malfunction. Refer to section 3-10b(14).
If fault is not corrected proceed to step 5.
5 Condenser pressure transducer defective. Check Condenser pressure transducer IAW
3-10b(8)(b).
Replace Condenser pressure transducer
IAW 3-10b(8)(c).
If fault is not corrected proceed to step 6.
6 Shortage of refrigerant. Check refrigerant IAW 3-10b(2)(e).
Recharge refrigerant IAW 3-10b(4).
o. Unit will not heat or has insufficient heating.
(1) No operation of any kind.
Step Probable Cause Remedy
1 Start-Stop switch OFF or defective. Check start-stop switch is in the ON position
and not defective IAW 3-10b(18)(l).
Replace defective start-stop switch IAW 3-
10b(18)(m).
If fault is not corrected proceed to step 2.
2 Circuit breaker OFF or defective. Ensure circuit breaker is set to ON.
Check for damaged or defective circuit
breaker IAW 3-10b(18)(q).
If circuit breaker is found to be defective,
replace IAW 3-10b(18)(r).
If fault is not corrected proceed to step 3.
3 External power source OFF. Turn ON external power source.
If fault is not corrected proceed to step d (2).