Rheem 310 Series Service Instructions Manual page 35

Fault Finding – Chart 4.3
4.3
Is
sensor T0
firmly plugged
into correct
socket?
YES
Test 5
Is
sensor T0
working?
YES
Switch off heat pump &
allow sensor T0 to cool
below 80ºC. When
sufficiently cool switch
heat pump back on.
Does red
LED immediately
go to 2 flash?
NO
Is circulator
operating?
NO
Test 10
Is 240V
present at the
circulator?
YES
Is the
Test 11
circulator motor
resistance
correct?
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
T0 is monitoring
water out of the
heat exchanger
sensor T0 cooled
YES
Circulator operation can be
checked by feeling circulator
brass body for vibration.
Is there
an air lock in the
water system?
NO
circulator plug firmly
NO
plugged into correct
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
Red 2 flash
T0 >80ºC
NO
NO
Has
NO
to below
80ºC?
YES
YES
YES
Is the
NO
socket?
YES
YES
NO
34
Ensure sensor T0 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 T0
Replace control board
Blockage of water system at
circulator, heat exchanger,
dropper tubes or flexible hoses.
Loose, damaged or jammed
circulator impellor.
Bleed air from water outlet at
flexible hose union.
Warning! Ensure water escaping
from flexible hose is caught in a
container and does not escape or
sensor strip damage may occur.
Ensure circulator is firmly plugged
into correct socket on control
board and that plug pins on
control board are clean and free
from conformal coating.
Replace control board
Check for loose, damaged or
jammed circulator impellor.
Replace circulator