Vulcan Electronic Gas Wall Furnace

The Vulcan Electronic Gas Wall Furnace is a natural gas wall furnace with a front electronic control panel and fan outlet grill at floor level(Part number 4702206B). Different furnaces with similar operation or internals could be under the brand Bonaire or Pyrox. The internal control PCB may be called either "EFD Ignition Unit" or "Ignitor Module" as part number E.0.501104, 501EFD or 4701201

=WARNING= This PCB requires AC Power (230V) and needs to be tested with live mains power to check operation. If you do not understand the dangers or take the correct precautions do not proceed with direct PCB testing and repairs, only use the front control panel.

Normal operation

 * 1) Turning on power at the wall should display the time on the front control panel
 * 1) After turning on the furnace from the front control panel the power light should come on and various settings should be displayed.
 * 1) After approximately 15 seconds, the clicking of the ignition spark should be heard for a few seconds and then gas will start to flow.
 * 2) Once the gas has been lit the spark will stop and the gas will continue burning.
 * 3) Once the furnace has reached a certain temperature the fan will turn on and blow warm air out of the grill at the bottom.
 * 4) When turned off the gas will stop immediately but the fan will continue to run until the furnace has cooled down.

Disassembly for access to internal PCB

 * 1) Remove 1 screw on each side near the bottom within the plastic grill (2 total) Vulcan Right Screw.jpg Vulcan Left Screw.jpg
 * 2) Remove 1 long screw from top Vulcan Top Screw.jpg
 * 3) Pull front cover out from the bottom and then lift over the top hanging lip, ensuring the earthing cable attached to the bottom left isn't pulled on.
 * 4) Stand front panel near left side. If wanting to to completely remove front panel, disconnect the cable plugs, earth cable and temperature sensor behind silver tape from the bottom left of front panel. Vulcan Front Cover Open.jpg Vulcan front panel connections.jpg
 * 5) Label all cables T3-T16. This is important to ensure you can connect the cables back in the correct order. Vulcan Internal Connections.jpg
 * 6) Disconnect all cables T3-T16 and cable to the center of ignition coil.
 * 7) Unscrew 4 screws holding plastic enclosure that contains the PCB.

Testing PCB ignition coil

 * 1) Ensure power is turned off.
 * 2) Connect T14 to earth.
 * 3) Connect T16 to neutral.
 * 4) Connect T10 to active.
 * 5) Connect T10 to T8. This allows the PCB to activate the coil.
 * 6) Connect earth to the top of the coil plastic shell without touching the center pin. This gives a place for the coil to discharge energy. If connected to earth the spark will not form.
 * 7) Turn on power.
 * 8) After a few seconds the charge will build and spark from the coil center to the earthed wire.
 * 9) Turn off power once the sparking has started or the board will reset.



PCB Expected power draw
Intial turn on 0W System on with clicking coil 5.7W Coil earthed in error mode 4.7w