Rheem 310 Series Service Instructions Manual page 34

Fault Finding – Chart 4.1
4.1
T4 is ambient
Is the
temperature at
sensor T4
< 2ºC?
NO
Is
sensor T4
firmly plugged
into correct
socket?
YES
Test 5
Is
sensor T4
working?
Note: Refer to page 5 for T sensor plug socket location on control board.
Fault Finding – Chart 4.2
4.2
Is the
sensor strip
firmly plugged
into the correct
socket?
YES
Test 4
Is the
sensor strip
working?
TM025 Rheem Heat Pump Service Instructions REV: B
Date of Issue: 02/08/07
This document is stored and maintained electronically by
Note: When T4 < -0ºC the system will enter boost mode. When in boost mode due
to this operation the system will reset and start at sequence 0 when T4 > 2ºC
air sensor
Red solid
º
T4 < 0 C
YES
NO
NO
YES
Red 1 flash
sensor strip fault
NO
NO
YES
33
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
System functioning correctly and
should operate in boost mode
until temperature at T4 rises
above 2ºC at which time the heat
pump will reset and start back at
sequence 0.
Ensure sensor T4 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 T4
Replace control board
Ensure sensor strip 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 strip
Replace control board