Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions

D.O.I: 2/06/2009

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Component Replacement Procedures

Front Panel

1. Isolate power, gas and water supplies.

2. Remove four screws, two from the top and two from the bottom of the Front Panel.

3. Remove the Front Panel.

PCB Assembly

1. Isolate power supply.

2. Remove the Front Panel. Refer to „Front Panel‟ procedure above.

3. Remove the retaining screw at top left hand side of the PCB.

4. Disconnect the multi-pin connectors from the PCB Assembly.

5. Undo the two red wires from transformer at bottom right hand side of PCB.

6. Carefully remove the PCB assembly.

7. Reassembly in reverse order of above. Note: When replacing a faulty PCB it is

important to ensure that the correct PCB is installed. Fitment of an incorrect PCB may

result in unit malfunction or a breach of the approval of the unit. Eg: If an 876 series

heater is installed and an 874 series PCB is incorrectly used to replace a faulty PCB

then the maximum temperature setting may exceed the approved maximum

temperature setting of 48ºC for an 876 series heater.

8. Restore power supply.

Lower Burner Assembly

1. Remove the Front Panel. Refer to „Front Panel‟ procedure above.

2. Remove the fourteen screws retaining the Lower Burner Assembly. Includes three

from the Proportional Gas Flow Regulating Valve and one retaining the Igniter.

3. Gently remove Lower Burner Assembly.

4. Reassemble in reverse order of above. Replace gaskets if required.

5. Test for gas leaks using soapy water solution.

Combustion Chamber Front Panel

1. Remove the Lower Burner Assembly. Refer to „Lower Burner Assembly‟ procedure

above.

2. Remove seven screws retaining the Combustion Chamber Front Panel.

3. Gently remove the Combustion Chamber Front Panel.

4. Reassemble in reverse order of above. Replace gaskets if required. NOTE: Ensure

wiring to Igniter and Flame Sensors is not pinched during reassembly.

5. Test for gas leaks using soapy water solution.