Rheem 310 Series Service Instructions Manual page 41

Fault Finding – Charts 4.9 to 4.13
4.9
T0 fault.
T0 is monitoring
water out of the
heat exchanger.
Is
T sensor
firmly plugged
into correct
socket?
YES
Test 5
Is
T sensor
working?
Note: Refer to page 5 for T sensor plug socket location on control board.
Fault Finding – Chart 4.14
4.14
Test 2
Are the
thermostat contacts
closed?
240V at the
NO
control board &
YES
Test 4
Is the
sensor strip
working?
YES
sensor strip plug
pins clean?
TM025 Rheem Heat Pump Service Instructions REV: B
Date of Issue: 02/08/07
This document is stored and maintained electronically by
4.10
T1 fault.
T1 is monitoring
water into the
heat exchanger.
YES
System in boost or limp mode - Software version 4.0 or higher
Test 3
Is there
relay?
System has operated in limp mode
due to a faulty sensor strip (S1 & S4
faults) and has completed a heating
NO
cycle. Water was heated by the
electric element and controlled by
the Robertshaw thermostat to 70ºC.
Are the
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
T sensor fault
4.11
T2 fault.
T2 is monitoring
the evaporator
temperature.
NO
NO
YES
NO
NO
YES
40
4.12
T3 fault.
T3 is monitoring T4 is monitoring
the compressor
discharge temp.
Ensure T sensor is firmly plugged
into correct socket on control
board and that plug pins on
control board are clean and free
from conformal coating.
Replace T sensor.
Replace control board.
Repair faulty wiring.
Replace control board.
Wiring incorrect.
Check control board wiring loom
plug (lower thermostat to control
board wiring loom).
Replace sensor strip.
Ensure sensor strip plug pins and
control board socket are clean
and free from conformal coating.
Replace control board.
4.13
T4 fault.
the ambient air
temperature.