TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Fault Finding Chart 5
Fault Finding Tests 32 and 33
Components will be “Live” when
conducting test, exercise caution
Conduct test with water flowing
Measure the voltage at the 3 pin connector
located between the water flow sensor and the
comparator. Measure the voltage between the
brown and black wires at this connector.
Voltage should be between DC2 – 5V.
Remove flow sensor turbine by following
component replacement procedure 21 on page
58.
The flow sensor turbine should spin freely.
Check for wear or blockage by foreign material
such as thread tape.
Burner Gas Pressure Check
Voltages up to 240 volts will be present within the water heater, take care
not to touch wiring terminals. Use an insulated tool when operating the DIP
switch or MIN and MAX buttons.
Minimum Burner Gas Pressure
1. Remove the front panel from the water
heater.
2. Remove burner test point screw and fit
manometer.
3. Turn on the remote controller (If fitted).
4. Open a hot tap slowly, to achieve the
minimum flow rate at which the burners
will ignite.
5. Press and hold the MIN button (“1L” is
displayed on the LED) and observe the
reading on the manometer.
6. Release the MIN button. If the reading
observed in step 5 agrees with the rating
label, no further adjustment is required.
Maximum Burner Gas Pressure
7. Open the hot tap fully to achieve
maximum flow rate.
8. Press and hold the MAX button (“4H” is
displayed on the LED) and observe the
reading on the manometer.
9. Release the MAX button. If the reading
observed in step 8 agrees with the rating
label, no further adjustment is required.
10. Turn the hot tap off.
11. Remove manometer and refit the burner
test point screw ensuring the seal is gas
tight.
12. Refit the front panel to the water heater.
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