Specifications

TM002 Integrity 18 & 20L Service Instructions REV: E
D.O.I: 7/11/2007
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Ignition Pack Replacement: (Procedure 12)
1. Remove the front panel. Refer to Procedure 1.
2. Disconnect high voltage lead from spark electrode.
3. Disconnect the multi pin connector from the Ignition Pack.
4. Remove the retaining screw.
5. Remove the Ignition Pack.
6. Reassemble in reverse order of above.
Flow Sensor: (Procedure 13)
1. Isolate cold water supply.
2. Remove the front panel. Refer to Procedure 1.
3. Disconnect the multi-pin plug to the flow sensor.
4. Remove 2 Philips head retaining screws.
5. Remove Flow Sensor (Note: Water may escape during this procedure).
6. Reassemble in reverse order of above.
Bypass Solenoid: (Procedure 14)
Note: Models with a -B suffix in the model number are fitted with a bypass solenoid e.g.
871020NF-B. For models without a -B suffix compare the appliance to the wiring diagrams
located on pages 6 & 7 to determine whether it has a mechanical or solenoid bypass.
The bypass solenoid is only available as part of the water body assembly. Follow
procedure 7.
Thermistors: (Procedure 15)
1. Remove the front Panel. Refer to Procedure 1.
2. Relieve water pressure through a hot tap.
3. Locate the Thermistor requiring replacement.
4. Disconnect the multi-pin plug from the Thermistor.
5. Remove the retaining screws and withdraw the thermistor taking care not to damage
the o-ring (Note: With the exception of the Ambient Air Thermistor, water may escape
during this procedure).
6. Reassemble in reverse order of above.
Over Heat Limiter Assembly: (Procedure 16)
Replacement of the Over Heat Limiter requires removal and possible replacement of the
Heat Exchanger.
1. Follow Procedure 11 to step 10.
2. Disconnect the multi-pin plug to the Over Heat Limiter Assembly.
3. Remove the screws retaining the Over Heat Limiter Assembly to the Jacket back and
remove the Over Heat Limiter Assembly.
4. Inspect the heat exchanger for holes or combustion damage.
5. Reassemble in reverse order of above (Note: Ensure all multi-pin plugs are
reconnected and all wiring is neatly repositioned and retained to prevent damage
during operation).
6. Test operation of water heater and ensure the MIN and MAX burner gas pressures are
correct. Refer to Procedure on page 48.