TM9-4120-370-14
TO35E9-229-1
Table 4-2. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER DOES NOT START IN ANY MODE.
Step 1. Check to see if input power has been disconnected.
Connect input power.
Step 2. Check to see if AC or DC CONTROL circuit breakers have tripped.
Reset circuit breaker.
Step 3. Check to see if compressor circuit breaker is tripped.
Slowly PULL out AND PUSH in reset knob TO RESET CIRCUIT BREAKER.
Check for loose or damaged electrical connectors or damaged wires in wiring harnesses,
Step 4
Tighten or replace connectors, or repair damaged wires.
Step 5. Check operation of the auxiliary switch in circuit breaker (CB1 ).
Test (CB1 ) auxiliary. (See para 449,) Replace circuit breaker if auxiliary switch is defective.
Step 6. Check operation of control power transformer (T).
Test transformer. (See para 4-51.)
Replace transformer, if defective.
Step 7. Check operation of RFI filter (FL 1, 2, 3, and 4) and d.c. rectifier (CR) assembly.
Test filters and rectifier. (See para 4-48.)
Replace defective filter(s) or rectifier.
Step 8. Check all terminals and internal wiring within junction box for tightness and damage.
Tighten terminals, or repair wiring as necessary. (See para 447.)
Step 9.
Check operation of mode selector switch (S),
Test switch. (See para 4-40. )
Replace switch, if defective.
2. CONDITIONED AIR (EVAPORATOR) FAN STARTS IN COOL MODE, BUT CONDENSER FAN DOES NOT
START AND COMPRESSOR DOES NOT START AFTER TIME DELAY.
NOTE
If power has just been connected to unit, a short (30 minute maximum during very cold
weather) warm up period is required. When compressor reaches a safe operating tem-
perature, it will come on automatically if mode selector switch is in the COOL mode.
