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I have a York furnace with a Honeywell ST9120B1005 fan timer board and a Honeywell S8600H ignition module. My problem is that when I turn the heat on nothing happens- no pilot, no fan. the thermostat "clicks" like it came on, but no action. When I went up into the attic to give the furnace a look over I noticed there was a transformer making quite a hum. I did not bring my multimeter home so I was unable to check any voltages. What would be a good starting point? I assume that transformer is stepping down the input voltage to around 24VAC. Is this transformer just used on the heating side, because my ac works well and the fan does work.

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Posted on Jan 02, 2017

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SOURCE: goodman ac/gas furnace unit mdl. # gmp075-4

i HAD THE SAME PROBLEM, TURNS OUT IT WAS THE FLAME SENSOR, CLEANED IT, AND ALL WAS GOOD

Posted on Dec 13, 2007

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  • 7 Answers

SOURCE: what is the spark voltage

the amount of voltage, will not really help you. i mean, its on the thousands?? why would you want to know that?

Posted on May 08, 2008

SOURCE: I have a Carrier 38tra048340

Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Posted on Jun 23, 2008

arealplumber
  • 33 Answers

SOURCE: pilot lite will not stay lite

You need to change the thermocouple on the unit.

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First check to see if the flame is hitting the thermocouple when the flame is on when you hold down the button. If it is then remove the the thermocouple and replace with the same size. You should be able to pick one up at your local hardware store.

If when you replace the thermocouple the flame does not stay lit still you may have a bad gas valve.
Hope this helps and please rate this!

Posted on Dec 08, 2008

  • 6 Answers

SOURCE: Goodman GMP075-3 ignition problem

bad board,i have had several board failures on goodman

Posted on Dec 31, 2008

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