Range Senator RFB006 6kW Installation And User Instructions Manual - page 19
REPLACING THE MAIN POWER BOARD
NOTE. BEFORE ANY MAINTENANCE IS CARRIED OUT ON THE SYSTEM, ENSURE THAT THE ELECTRICAL SUPPLY HAS
BEEN DISCONNECTED FIRST. CARE MUST BE TAKEN AS THE WATER MAY BE SCALDING HOT AND AT HIGH PRESSURE.
Maintenance on the boiler can only be carried out by a qualified and competent tradesman in accordance with these instructions.
Removal of the Main Power Board
Switch OFF ALL electrical supply to the boiler. Both Main, “Live and Neutral”, and Control “D and N” must be isolated.
Remove the front panel and disconnect earth.
Disconnect CN1, CN2, CN3, CN13 at the top of the board, See fig 8 (page 17).
Disconnect CN12, CN14 & PL1 on the bottom of the board.
Remove manual reset high limit switch from heat sink block.
Clip restraining cable tie from top temp sensor wire to main power cables.
Disconnect inbound Live, Neutral and Earth cables and adjacent earth bond wire from main terminal block.
Remove 2 x screws from main terminal block to main terminal mounting.
Note the assembly position in relation to pipe.
Restrain power board assembly.
Remove four retaining screws from clamps at rear.
Withdraw assembly.
Disconnect all the heater element cables from the end of the heater unit, noting where each one goes.
Replacing the Main Power Board
Clean the top 22 mm pipe.
Adequately coat the power board pipe contact surface with heat sink compound.
Replace the heater cables in their original order as previously noted.
Position power board assembly as previously noted.
Replace the four retaining screws to the clamps at rear.
Replace the manual reset high limit switch to the heat sink block. (Clean and apply compound).
Reconnect all electrical connections on their original places.
Ensure both high limits are depressed.
Reconnect the main power connections. Ensure these connections are tight. Loose connections can cause a fire.
Re-attach the earth wire, refit front case and test.
Ensure all cables are restrained by ties as per original wiring.
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