TM017 Rheem Air Sourced Heat Pump Service Instructions REV: C
Date of Issue: 5/11/05
This document is stored and maintained electronically by
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”.
24
De-ice Thermostat Fault Finding - Chart 2.3
2.3
Are
the de-ice
thermostat contacts
closed?
Test 12
Is the
bypass solenoid
open circuit?
NO
YES
Remove obstruction or clear
evaporator
NO
YES
Is the
evaporator fan
running?
Replace de-ice thermostat
Is
the air flow
obstructed?
Long periods of cold weather
will result in poor recovery
performance
NO
2.1
YES
Replace bypass valve solenoid
YES
Test 11
Evaporator Thermostat Fault Finding - Chart 2.4
2.4
Is
the heat
pump in boost
mode?
Test 18
Does the
boost circuit
have the correct
resistance?
NO
YES
YES
Replace evaporator thermostat
8
Test 13
3
NO
NOTE: While in boost mode the evaporator will defrost naturally, depending on the
ice build up this may take several hours