Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
32
No Error Code Fault Finding
1y = Water flow
detected by water
flow sensor
NO
Read
maintenance
information 1y
YES
NO
Replace the PCB assembly.NO
YES
YES
Replace the water flow sensor. If
the fault persists replace the
water body assembly.
NO
YES
Controllers must not be
fitted when used as an
in-series gas booster.
Remove controllers.
YES
NO
244, 274, 874 Series models do
not require a solar bypass valve.
Remove the solar bypass valve
and remake water connections
directly to unit.
YES
244, 274, 874 Series
NO
Water will flow straight through
the unit without ignition attempt.
Normal operation.
NO
YES
Read maintenance
information 3y
3y = Water temp
detected by water
inlet thermistor
246, 276, 876 Series
246, 276, 876 Series models are
not suitable for use as in-series
gas boosters.
What is
the model
number?
NO
Free the flow sensor turbine.YES
Is the unit used as
an in-series gas
booster?
Is 1y displaying a
flow greater than
2.5lpm?
Are controllers
fitted?
Is the voltage
between terminals 2
& 3 at connector R
normal?
Test 4
Is the voltage
between terminals 1
& 2 at connector R
normal?
Test 5
Is the flow sensor
turbine jammed?
Test 6
Is the water entering
the unit < 58ºC or
< the set temp - 2ºC?
Is a solar bypass
valve fitted?
Is water flow
through unit greater
than 2.5lpm?
Open hot tap further.NO
Replace the PCB assembly.
YES
A
A