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OPACH4212 Troubleshooting Guide
Start Up
Thermostat Display will not Illuminate
Check Incoming Power. Correct power supplied to unit.
Check MAIN Breaker and reset it, if needed.
Check the Thermostat Cable Connection at the unit. Re-seat the connector.
Thermostat works, Not Cooling
Check the thermostat to see if in COOL mode.
Check the thermostat to see if the setpoint is three degrees lower than the space
temperature. Adjust the setpoint if needed, or wait until the space warms.
Check the incoming power for proper voltage plus the proper amperage to start
the compressor. If not, contact an electrician.
Thermostat works, Not Heating
Check the thermostat to see if in HEAT mode.
Check the thermostat to see if the setpoint is three degrees higher than the space
temperature. Adjust the setpoint if needed, or wait until the space cools.
Check the incoming power for proper voltage plus the proper amperage to start
the compressor. If not, contact an electrician.
If outdoor temperature is below 50 degrees, remove the controls access panel and the
blower access panel, and check the Aux. Heater Breaker. Breaker will display RED
when tripped. Reset the breaker. The breaker will display GREEN when on.
MODEL: OPACH4212
TROUBLESHOOTING GUIDE
Page 10
Model Number:
OA-EISM-OPACH4212- REV. 04062023
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