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Manual 2100-549G
Page 51 of 59
TROUBLESHOOTING
SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE
1. NOTE: A thorough understanding of the defrost
cycle sequence is essential. Review that section
earlier in this manual prior to troubleshooting the
control. Turn on AC power supply to unit.
2. Turn thermostat blower switch to “fan on” – the
indoor blower should start. (If it doesn’t,
troubleshoot indoor unit and correct problem.)
3. Turn thermostat blower to “auto” position. Indoor
blower should stop.
4. Set system switch to “heat” or “cool”. Adjust
thermostat to call for heat or cool. The indoor
blower, compressor and outdoor fan should start.
NOTE: If there was no power to 24 volt transformer,
the compressor and outdoor fan motor will
not start for 5 minutes. This is because of
the compressor short cycle protection.
CODES FUNCTION
Slow Blink Normal Operation
Fast Blink Compressor Time Delay
1 Blink Low Pressure Switch Failure
2 Blink High Pressure Switch Failure
or Condensate Overflow
Switch Activated
3 Blink Defrost Mode Active
4 Blink High Pressure Soft Lockout
TABLE 5
TROUBLESHOOTING
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