Rheem 310 Series Service Instructions Manual page 36

Fault Finding – Chart 4.4
4.4
T2 is evaporator
sensor
Is the
temperature at
sensor T2
< 2ºC?
T2 temperature can
be measured by
inserting thermometer
probe into evaporator
fins next to sensor T2.
YES
Is the
ambient air
temperature <
º
5 C?
Raise temperature of sensor T2 to
evaporator and holding probe between
NO
thumb & fingers. Heat pump should
auto reset to sequence 0 when T2
raises above 2ºC. Ensure sensor
probe is reinserted into evaporator on
Is the
evaporator fan
running?
NO
present at the fan
YES
Test 17
Are the
fan motor winding
resistances
correct?
YES
fan capacitor
Note: Refer to page 5 for T sensor plug socket location on control board.
TM025 Rheem Heat Pump Service Instructions REV: B
Date of Issue: 02/08/07
This document is stored and maintained electronically by
Note: When T2 < -3ºC the system will enter boost mode. When in boost mode due
to this operation the system will reset and start at sequence 0 when T2 > 2ºC
Is
sensor T2
NO firmly plugged
into correct
socket?
YES
Is
sensor T2
working?
above 2ºC by removing from
completion of testing procedure.
YES
Is
YES the air flow
obstructed?
Test 16
Is 240V
NO
terminals?
Test 18
Is the
working?
Red 3 flash
T2 < -3ºC
NO
Test 5
NO
YES
YES
Did the
system reset &
operate in normal
heat pump
mode?
YES
NO
Is the
evaporator fan firmly
plugged into correct
socket?
YES
NO
NO
YES
35
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
Ensure sensor T2 is firmly
plugged into correct socket on
control board and that plug pins
on control board are clean and
free from conformal coating.
Replace sensor T2
Replace control board
System functioning correctly and
should operate in boost mode
until evaporator temperature rises
above 2ºC at which time the heat
pump will reset and start back at
sequence 0.
NO
Note: Compresor
will not start until
30 seconds after
the circulator
Remove obstruction.
Clean dirty evaporator.
Appliance installed in enclosed
room contrary to installation
instructions. Appliance is suitable
for outdoor installation only.
Ensure evaporator fan is firmly
plugged into correct socket on
NO control board and that plug pins
on control board are clean and
free from conformal coating.
Replace control board
Replace evaporator fan motor
Replace capacitor
Repair faulty wiring