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    dannykan's Avatar
    dannykan Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Oct 21, 2009, 10:02 AM
    Fireplace mainburner doesn't light
    Hi,

    I have a millivolt Honeywell gas control system for my fireplace. The pilot is on.
    The thermopile voltage on the terminals is 663 mV. I checked the burner orifice and it is OK. When I command the mainburner to come on, nothing happens.
    Would please advise how to proceed.

    Regards,
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 21, 2009, 10:11 AM
    Some fireplaced also have a thermocouple besides having a thermopile. If so it is possible the thermocouple is defective.
    dannykan's Avatar
    dannykan Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Nov 6, 2009, 09:58 AM
    Quote Originally Posted by hvac1000 View Post
    Some fireplaced also have a thermocouple besides having a thermopile. If so it is possible the thermocouple is defective.
    I have replaced the thermocouple and cleaned up the thermopile. I am now reading 773 mv.
    The main flame is still not coming on!
    Valve info: Honeywell millivolt Gas valve; VS8420E or 82L8601
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Nov 6, 2009, 06:11 PM
    Check to see if that milivoltage is getting to the gas valve. If it is and the valve is not opening then I would suspect the valve. This might not be your fireplace setup exactly but the two items below might help.
    Attached Images
  1. File Type: pdf Milivolt system.pdf (62.6 KB, 309 views)
  2. File Type: pdf AAAAAAAAAAAAAAAA.pdf (27.9 KB, 284 views)
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