Table 4-2. Troubleshooting - TM-5-4120-337-140036

Corrective Action

Probable Cause

Malfunction

e. R e p l a c e d a m a g e d f a n i n l e t r i n g

e. D a m a g e d e v a p o r a t o r f a n i n l e t r i n g .

(para 4-30).

a. C l e a n d i r t y c o m p o n e n t s a n d

a. D i r t y c o n d e n s e r c o i l . c o n d e n s e r

4. I n s u f f i c i e n t c o n d e n s e r a i r f l o w .

remove obstructions (para 4-67, 4-

coil guard. condenser fan guard.

Fan motor runs correctly.

14 or 4-31).

condenser fan or other obstructions

to air movement.

b. R e p l a c e d a m a g e d

component

b. D a m a g e d c o n d e n s e r c o i l g u a r d o r

(para 4-14).

condenser fan gnard.

Replace condenser fan (para 4-31).

c. D a m a g e d c o n d e n s e r f a n .

a. R e p l a c e b l o w n f u s e ( p a r a 4 - 4 2 ) .

a. B l o w n f u s e F 1 o r F 2 .

5. N o p o w e r t o l o w v o l t a g e c o n t r o l

after inspecting for cause of fuse

circuit.

failure. Refer to figure 1-5 and 1-7

for electrical check points and

schematic electrical diagram.

b. R e f e r t o f i g u r e 1 - 5 f o r e l e c t r i c a l

b. D e f e c t i v e w i r i n g .

check points. Check connectors for

tightness and wiring for continuity

and shorted conditions. Repair

defective wiring (para 4-49 and 4-

53).

c. R e p l a c e d e f e c t i v e c o m p o n e n t s

c. D e f e c t i v e m o d e s e l e c t o r s w i t c h .

(para 4-44, 4-37, 4-38 or 4-39)

circuit breaker, transformer or

rectifier.

a. S e e m a l f u n c t i o n N o . 5 .

a. N o p o w e r t o l o w v o l t a g e c o n t r o l

6. Compressor will not

start.

Fan

circuit.

motor runs correctly.

b. R e p l a c e

defective

components

b. D e f e c t i v e m o d e s e l e c t o r s w i t c h .

(para 4-44, 4-47, 4-37, 4-40, 4-48

compressor

run

capacitor,

circuit

or 4-41).

breaker, time delay relay, outside

air thermostat or compressor relay.

c. Refer to fig. 1-5 for electrical check

c. D e f e c t i v e w i r i n g .

points. Check connectors for

tightness and wiring for continuity

and shorted conditions. Repair

defective

wiring

(para

4-49

and

53)

d. W a i t f o r t h e c o m p r e s s o r t o c o o l

d. Open

compressor

thermal

over

and check for continuity. If still

load protector.

open refer to G S maintenance (para

4-58).

a. Refer to fig. 1-5 for electrical check

a. D e f e c t i v e w i r i n g .

7. C o m p r e s s o r s t a r t s b u t c y c l e s o n

points. Check connectors for

thermal overload protector.

Fan

tightness and wiring for continuity

motor runs correctly.

and shorted conditions, Repair

defective wiring (para 4-49 and 4-

53).

b. R e p l a c e c a p a c i t o r ( p a r a 4 - 4 7 ) .

run

compressor

b. D e f e c t i v e

capacitor.

c. R e f e r t o m a l f u n c t i o n N o s . 3 a n d 4 .

c. Restricted or

insufficient

evaporator or condenser air flow.

a. C h e c k w i r i n g t o s o l e n o i d v a l v e a n d

8. L i t t l e o r n o t c o o l i n g . C o m p r e s s o r

a. Compressor bypass solenoid valve

repair as required (para 4-49 and 4-

and fan motor run.

does not close when the air con-

53). Check solenoid valve electrical

ditioner is on the cooling mode.

coil to insure that when energized,

Liquid line solenoid remains closed

it closes.

when temperature control ther-

mostat is calling for cooling.

b. R e p l a c e

b. D e f e c t i v e t e m p e r a t u r e c o n t r o l

defective

thermostat

(para

4-45).

thermostat.

c. R e f e r t o f i g u r e 1 - 5 f o r e l e c t r i c a l

c. Defective wiring.

check points. Check connections

for tightness and wiring for shorted

conditions. Repair defective wiring

(para 4-49 and 4-53).

d. R e f e r t o m a l f u n c t i o n N o s . 3 a n d 4 .

d. Restricted or

insufficient

evaporator or condenser air flow.

4-4