TM017 Rheem Air Sourced Heat Pump Service Instructions REV: C
Date of Issue: 5/11/05
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14
Thermostat Circuit Fault Finding - Chart 1.1
1.1
Is the
evaporator fan
running?
Test 3
Is the
resistance of
the fan motor
correct?
NO
YES
Replace thermostat
1.5
Test 2 - 550275 and 551275
Test 2A - 551275/A
NO
Are the
thermostat contacts
closed?
Isolate power
NO
2.1
Replace fan motor and reset
compressor over temperature
cut out
NO
YES
Is the
fan motor
seized?
YES
YES
Fault in electrical wiring
Locate and repair
NO
Is the
resistance of
the compressor
correct?
Test 4
Replace compressor
NO
Is there
240 volts to the
compressor?
Test 6
Fault in electrical wiring
Locate and repair
NO
YES
Has
the capacitor
failed?
Test 5
Replace capacitor and reset
overload
YES
Has the
compressor overload
tripped?
Test 3A
NO
YES
1.2
YES