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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 H & Error Code J
NOYES
Is water supply to
BWU ok?
Is level probe ok?
(TEST 4)
NO
YES
Error Code H
Low level
probe fault
Restore water supply to BWU.
Ensure stop cock or isolation
valve is open. If an additional
water filter is installed check to
ensure it is not blocked.
Clean or replace level probe.
Ensure probes are not touching
each other or the probe housing
(earth).
Is level probe
wiring connector ok?
Ensure connector plug & socket
is firmly connected. Replace
connector if necessary.
NO
Replace level probe.
YES
Error Code J
High level
probe fault
Is level probe firmly
plugged into control
board?
NO
Ensure level probe is firmly
plugged into correct socket on
control board.
Is level probe wiring
O/C or S/C?
NO
YES
Was original error
code H or J?
YES
4.2
J
Is high level probe
insulation correct
length?
H
Replace level probe.NO
Chart 4.2 is part of and can
be located within chart 4.
Replace control board.YES
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