Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: heater problem
The first thing I would look for is a blockage in the gasline, or at the gas valve.
It sounds like you are not getting gas to the ignitor/burners. This would cause it to obviosly, not sense flame.
When a unit does not sense flame, it will shut of, and usually try again up to 5 times (depending on brand/model)
So here's what happens in that scenario.
Call for heat.
Inducer motor kicks on, the sensor detects the inducer motor is working, and the ignitor starts glowing/sparking (depending on type of ignitor)
It will then send gas through the gas valve and ignite.
If the flame sensor does not detect flame, the glow coil shuts down, the gas shuts off, the inducer shuts off and you get your error code.
(Some units will then send on the blower motor, and you have to cut power to reset.)
Do you have a copper line with natural gas?
If so, replace it with stainless steel or black iron.
Coper apearantly reacts with the aditives in natural gas and tends to form a gray ashy substance that builds up in the copper tubings walls and eventually cloggs gas valves.
At the inlet side of the gas valve, there should be a screen to catch such things.
Turn off the gas, turn of the power, and remove the gas line going to the gas valve. Look for anything clogging that area, also look for kinks in the gas line.
Remember to use a "flamable gas approved" pipe dope or thread tape when reinstalling the supply line.
Lets see what you find there and then we can continue the diagnostic if needed.
Posted on Dec 10, 2008
Sounds like two problems. Not enough combustion air or a defective high temperature limit switch. You enclosure may not be getting enough outside air to properly sustain combustion. If the unit has a rollout thermostat it may be defective and stopping everything.
Posted on Oct 10, 2009
No, the board isnt out. The board has a code telling you that its out. Its your flame sensor. You wouldn't have gotten any heat if the gas valve was out. check if that flame sensor goes to another sensor on the same circuit , if it does check that. If it just a one wire sensor make sure its in the right position. If its a one rod flame senor with one wire I would sand it down with sandpaper. if its a two wire senor ohm it out to see if you ger current going through it.
Posted on Oct 16, 2009
The problem you have is water in the exhaust pipe.
Check to see if the pipe has sagged anywhere or if there is a trap in the line.
If you hear gurgling then it is definetly water....
Some times can be hard to find, even a pipe 1/4 full will cause problems. They are very sensitive to flue problems.
Make sure that the flue pipe either runs back to the furnace or out to the outside, a continuos slope either way witha high spot in the middle.
Also check the bottom drain of the blower if it has one, have had them plug and trap water also..
I hope that this will help you to solve your problem!
Thanks for using Fixya!!
Posted on Dec 24, 2009
Hi jump out the presure switch see if it lights check fan control is clean at the back of it check air filter is clean
Posted on Feb 22, 2010
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