51
warmhaus.com
5.8. FLOW & RETURN THERMISTOR REPLACEMENT
CAUTION
Please follow the steps listed in replacement of components FIRST STAGE
1. Disconnect the thermistor lead from the flow or return thermistor unit.
2. Unclip and remove the flow or return thermistor from the pipe work and
withdraw the thermistor from the boiler.
3. Re-fit the thermistor to the pipe work and ensure it is securely clipped and
in good contact with the pipe work and located into the locator tab.
4. Re-connect the thermistor lead to the thermistor.
Please follow the step listed in replacement of components FINAL STAGE.
5.9. INTERFACE PCB REPLACEMENT
CAUTION
Please follow the steps listed in replacement of components – FIRST STAGE
1. Unplug the flat cable between main panel and LCD interface
2. Remove the 4 retaining clips and remove the back plastic of the interface.
3. Unplug the 4 screws to secure the Interface PCB to the connection posts.
4. Lift the Interface PCB out of the housing
5. Put the 6 springs to the front plastic holes.
Please follow the step listed in replacement of components FINAL STAGE.
5.10. MAIN PCB REPLACEMENT
CAUTION
Please follow the steps listed in replacement of components – FIRST STAGE
1. Carefully remove the 8 retaining clips and remove the control box cover.
2. Remove the 2 screws that secure the PCB.
3. Gently spread the two side retaining clips and lift the PCB upwards
ensuring it clears the four corner locating posts.
4. Unplug all electrical connections from the PCB and make a note of where
each connection is located (wiring diagram can be used in reference
for connection locations)
5. If the EEPROM on the existing PCB is in good working order it maybe be
transferred to the new PCB, however the following checks must be carried
out to ensure they match the default settings in the parameter list.
6. Check P15 value on the parameter list
7. Check P22 value on the parameter list
8. Check P44 value on the parameter list
9. Check P46 value on the parameter list
10. If you wish to use the new EEPROM supplied with the new PCB then the
above checks must also be carried out.
11. Re-connect all electrical connections to the PCB ensuring they are
connected correctly.
12. Install the PCB in reverse order as the above instructions 3,2,1.
13. When power is restored to the boiler and a new EEPROM has been used
the boiler LCD will display E62 error code.
14. To clear the error code you must run Auto Calibration.
Please follow the step listed in replacement of components FINAL STAGE.
5.11. 3-WAY INNER KIT REPLACEMENT - TOP
CAUTION
Please follow the steps listed in replacement of components – FIRST STAGE
1. Refer to the Draining the Boiler CH circuit section
2. Remove the diverter valve actuator and place safely within the boiler.
3. Unscrew the top brass connection nut and withdraw the 3 way valve inner
cartridge upwards and out of the boiler.
4. Ensure the brass manifold is clean.
5. Screw the new 3 way valve inner cartridge into the brass manifold ensuring
the spindle connects and fits into the bottom O-ring, tighten the cartridge.
6. Re-pressurize the boiler and bleed all excess air.
7. Re-connect the diverter valve actuator.
Please follow the step listed in replacement of components FINAL STAGE.
5.12. PUMP HEAD REPLACEMENT
CAUTION
Please follow the steps listed in replacement of components – FIRST STAGE
1. Refer to the Draining the Boiler CH circuit section.
2. Disconnect the electrical connector plugs from the pump.
3. Remove the 4 x screws securing the pump head.
4. Remove the pump head and ensure the pump head housing is clean.
5. Install the new pump head and secure the 4 x pump head securing screws.
6. Reconnect the electrical connector plugs to the pump.
7. Re-pressurize the boiler and bleed all excess air.
Please follow the step listed in replacement of components FINAL STAGE.
