Author Topic: Ignition Lockout, near 0 degrees, Interesting problem found.  (Read 1306 times)

Online Wedgeman55

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Any of you who live in the tundra like myself,   here is something to think about if your having problems with furnace when the temp drops to near 0 temperatures.     
 
Went out to repair a unit today at customer's home.   Temp was 12 degrees daytime,  near 3 at night.    Unit was locked out when I got there,  Ignition lockout according to code.  I reset computer,   fired it up and it attemped to start 4 times.    Would fire,  then go right out.      Forced vent motor,  fine.   Pressure switch,  OK.    Flame was lighting up on 2 of the flame tube orifices.   
 
I suspected either bad gas valve or low gas pressure.   Turns out,  very low gas pressure.   Upon talking to someone,   they said moisture in gas lines which ends up in the meters causes the meters to freeze,  and deliver low pressure.    Furnace was fine once gas company came out and put on new meter for customer.    Something for you guys to think about when servicing in these cold temperatures.     May not be the unit itself. 
Commercial Laundry repair Tech and Installer  1973 to 1980
Service Manager / Technician Commercial Laundry repair company 1980 to 2002
Refrigeration - HVAC - Boiler School 1974-1976
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Offline RegUS_PatOff

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Re: Ignition Lockout, near 0 degrees, Interesting problem found.
« Reply #1 on: January 25, 2013, 02:49:30 AM »
is that the only gas appliance in the house ?
(does it affect the Gas wter heater / range / etc)
 
(Milwaukee, Wisconsin)  :santa_wink:
 
« Last Edit: January 25, 2013, 02:51:00 AM by RegUS_PatOff »
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Online Wedgeman55

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Re: Ignition Lockout, near 0 degrees, Interesting problem found.
« Reply #2 on: January 26, 2013, 01:42:07 PM »
Wierd enough,  Reg,  she had an electric oven and electric hot water heater but gas furnace.    Otherwise,  might have told me no hot water either I would have figured it out easier.
Commercial Laundry repair Tech and Installer  1973 to 1980
Service Manager / Technician Commercial Laundry repair company 1980 to 2002
Refrigeration - HVAC - Boiler School 1974-1976
Electronic School 1978-1979
Self Employed Appliance Repair Company 2002 to present

Online Wedgeman55

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  • Member Since: Aug 2008
  • Posts: 856
  • Country: us
  • Man vs Appliance - Never give up, Never surrender
Re: Ignition Lockout, near 0 degrees, Interesting problem found.
« Reply #3 on: January 26, 2013, 01:43:20 PM »
It would affect the dryer also,  flame would not be as large,  maybe take longer to dry or kick out the hi limit thermo on the tube.   
Commercial Laundry repair Tech and Installer  1973 to 1980
Service Manager / Technician Commercial Laundry repair company 1980 to 2002
Refrigeration - HVAC - Boiler School 1974-1976
Electronic School 1978-1979
Self Employed Appliance Repair Company 2002 to present

Offline videobruce

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Re: Ignition Lockout, near 0 degrees, Interesting problem found.
« Reply #4 on: February 17, 2013, 08:48:59 AM »
Also, water in the underground supply main that collect in a low spot will cause furnaces to pulsate the flame due to bursts of gas getting by the water pocket.

This happened to a neighbor three doors away. The utility replaced the line.

Offline jumptrout51

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Re: Ignition Lockout, near 0 degrees, Interesting problem found.
« Reply #5 on: February 17, 2013, 09:41:32 AM »
It will also happen at the gas valve if a gas supply drip leg is not installed.
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