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TM5-4120-387-14
TABLE 4-2. TROUBLESHOOTING (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check operation of heater thermostat (S3).
Test thermostat.
(See para 4-56.) Replace thermostat if
defective.
Step 3.
Check operation of mode selector switch (S).
Test switch.
(See para 4-47.) Replace switch if defective.
8.
HEAT IN HI HEAT MODE, BUT NOT IN LO HEAT MODE.
Step 1.
Check for loose or damaged electrical connectors, or damaged wires
in wiring harnesses.
Voltages used can kill.
Always disconnect power cord to
air conditioner before performing any internal
maintenance.
Shutting unit off at its control panel does
not disconnect unit power.
Tighten or replace loose or damaged connectors, or repair
damaged wires.
Step 2.
Check operation of Temperature control thermostat (S1).
a.
Inspect sensing bulb and capillary for damage or leakage.
(See para 4-46.) Replace entire control if bulb is damaged
or leaking.
b.
Test switch in Temperature control thermostat. (See para
4-46.) Replace entire control, if defective.
Step 3.
Check operation of mode selector switch (S).
Test switch.
(See para 4-47.) Replace switch if defective.
9.
FAN MOTOR (B2) DOES NOT OPERATE.
Voltages used can kill.
Always disconnect power cord to
air conditioner before performing any internal
maintenance.
Shutting unit off at its control panel does
not disconnect unit power.
Step 1.
Using wiring diagram (fig. 4-7), check electrical connectors P2 and
J2, P4 and J4, and individual wires for tightness and continuity.
Tighten, repair, or replace as indicated.
4-48
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