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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”
Fault Finding Chart 1 (Proxy timer recommended for fault finding on 703 series)
1
NO
Is the fuse blown at
the switchboard?
NO
YES
Did the fuse blow
again?
YES
NO
Is 240 volts present
at terminal block?
(TEST 2A or 2B)
Household wiring or power point
faulty. Advise customer to call
an electrician.
NO
Is 240 volts present
at the power point?
(TEST 1)
1.1
Is 240 volts present
at the power point?
(TEST 1)
Faulty fuse replaced. Check
appliance operation.
YES
NO
YES
Test 2A for 3 – 15L models
Test 2B for 25 & 40L models
Replace faulty cord set.
Is 240 volts present
at control board?
(TEST 3A or 3B)
YES
Repair O/C wiring.NO
Test 3A for 3 – 15L models
Test 3B for 25 & 40L models
Does timer display an
error code other than
error code B?
YES
Refer to fault finding chart for
error code displayed.
YES
701,702 & 703 Series BWU’s do not use a Chiller,
therefore error code B will always be displayed. This
is normal operation.
Refer to section
on ‘Timer”
Is complaint for no or
low water flow?
4.1
NO
YES
Chart 4.1 is part of and can
be located within chart 4
Is BW thermistor ok?
NO
Replace BW thermistor.NO
Refer to section on ‘Testing the
Boiling Water Thermistor’.
Is BW thermistor
wiring connector ok?
Ensure connector plug & socket
is firmly connected. Replace
connector if necessary.
YES
NO
YES
1.2
Chart 1.2 is part of and can
be located within Error code
L fault finding chart.
Is BW thermistor
Firmly plugged into
control board?
Ensure BW thermistor is firmly
plugged into correct socket on
control board.
NO
YES
Note if 703 Series,
with no proxy timer
display, go to Fault
Finding Chart 1.1a,
on following page
Replace Fuse
To Next Page
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