Troubleshooting – Bard QTEC SERIES PACKAGED HEAT PUMP Q30H1 User Manual
Page 36
Manual 2100-519
Page
36 of 42
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. NOTE: Many models have a
1-minute blower time delay on “off” command;
wait for this to time-out.
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
3 Blink
Defrost Mode Active
TABLE 5
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