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TM063 701, 702 & 703 Series Boiling Water Unit Service Instructions
Revision D: Feb 2017
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Error Code A
NO
YES
Is BW thermistor ok?
Is BW thermistor
wiring connector ok?
NO
YES
Error Code A
BW thermistor
O/C or S/C
Replace BW thermistor.
Ensure connector plug & socket
is firmly connected. Replace
connector if necessary.
Refer to section on ‘Testing the
Boiling Water Thermistor’.
Is BW thermistor
firmly plugged into
control board?
Ensure BW thermistor is firmly
plugged into correct socket on
control board.
NO
Repair or replace O/C or S/C
BW thermistor wiring.
YES
Error Code B
Chiller unit cold
thermistor O/C
or S/C
701, 702 & 703 Series BWU’s
do not use a Chiller
Unit therefore error code B will
always be displayed.
This is normal operation.
Continue fault finding.
Error Code C Triac S/C
Check BW element circuit for
possible short circuit and
replace control board if short
circuit is not present.
Error Code D
Leak detected
(BWU or chiller unit)
701, 702 & 703 Series BWU’s do not use a
leak sensor, error code D is not applicable.
Continue fault finding.
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