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Manual 2100-511F
Page 19 of 27
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.
TABLE 1
TROUBLESHOOTING
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8#petSotog=oN;4#petSotog=seY
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9#petSotog=oN;31#petSotog=seY
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.langistuptuorosserpmoCrofkcehC.01
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LED BLINK CODES
BLINK FUNCTION
Slow Normal function (1.0 sec on/1.0 sec off)
Fast ASCD timer active (0.1 sec on/0.1 sec off)
1 Low pressure switch failure
2 High pressure switch failure/“Soft” Lockout
3 Defrost mode active
4 High pressure switch failure/“Hard” Lockout