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ICP furnace not working

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lammel01
lammel01 Member Posts: 3
edited October 2021 in THE MAIN WALL
I have ICP furnace that is current not working when heating is requested.

I am looking for help on if there is 120 V going from control board to gas valve. Gas valve is not passing on the 120V to inducer motor. Due to which it is not starting.

I have tested inducer motor by isolating it and it operates fine.

Any idea if there is something wrong with gas valve.

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  • lammel01
    lammel01 Member Posts: 3
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  • lammel01
    lammel01 Member Posts: 3
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    Here is what the circuit looks like
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,524
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    First you need 24v and 120 volts to the board.The normal sequence is on a call for heat is first the inducer starts, the pressure switch(s) prove the inducer is running then you get ignition & gas valve
    Ironman
  • HVACNUT
    HVACNUT Member Posts: 5,835
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    Do not "test" the gas valve with 120v.
    The gas valve is 24v only.
    The board doesn't have diagnostics?
    Try turning off the power for 5 minutes with the thermostat turned down below room temperature. Turn power back on and raise the thermostat. See what the furnace does and look for a code.
    If the inducer isn't even starting, then the board doesn't know there's a call for heat or it's in lockout. 
  • Ironman
    Ironman Member Posts: 7,376
    edited October 2021
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    I would highly recommend that you get a qualified tech to repair this.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.

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