7–31
62-11785
00098
CHECK HIGH TEMP THERMOSTAT
• ACTIVATION: With the Main Power switch toggled out of the OFF position, the EVHTS circuit is open.
• UNIT CONTROL: Alarm AND no heat allowed.
• RESET CONDITION: Auto Reset when the EVHTS circuit is okay for 15 minutes, or alarm may be manu-
ally reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check Evaporator Area For High Temperature
- Check Evaporator temperature using a test thermom-
eter. EVHTS opens when the temperature of the evaporator becomes very high (Refer to
).
(For example, if the heaters are on when the fan is not running.) If the temperature of the evaporator sec-
tion is very warm (hot), it will have to cool down before the EVHTS closes.
2.
Check High Temperature Thermostat (EVHTS)
- Inspect thermostat and connector. (See wiring sche-
matic
.) No damage to thermostat. No damage or corrosion in connector.
3.
Check High Temperature Contacts
a. Contacts must be closed when temperature is normal. Unplug EVHTS and check for continuity.
Must be 0 (zero) Ohms. Cannot be open (infinite ohms) or shorted to ground. If HTT is open below
temperature, (Refer to
) replace HTT.
b. Check ground at 2CCB35. If ground not good, check connectors and wiring between terminals for
damage, moisture or corrosion.
c. Check SP-71, SP-72, SP-50. If ground not good, check connectors and wiring between terminals
for damage, moisture or corrosion.
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