Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner
I have a Carrier Crusader Gas furnace that just went out. Model #58dhc055-EC. I woke up this morning and it was 50 degrees. When I turn the furnace onto Auto by the thermostrat, the furnace turns on. The induced draft motor starts and doesn't ever stop running. I also notice that the hot surface ignitor is not heating up, but it doesn't look bad.
I also left the door to the furnace room closed overnight. So, the furnace was not getting any air circulation. It was completely closed in without any air flow.
I don't know if that would cause this problem or not but I am pretty desperate for help.
Any troubleshooting ideas would be fantastic!
Sounds like the Hot Surface Ignitor is bad. When you replace it do not touch the surface of Ignitor very important to keep human oil off it. The part is only about 25 bucks. Also have you looked in the blower compartment for the circuit board usually on the squirrel cage. The check the Ignitor for resistance.
Posted on Nov 23, 2008
The door closed or open should have no effect. The draft motor runs, no power to the glow plug or it is open,
The first place to look is at the furnace brain, a box located somewhere in the unit connecting to the gas valve, look at this brain [controller] and there should be a light of series of lights.
On the box itself there should be a matrix of codes such as: green light flashing= bad glow plug, or red, bad controller box, do you have anything like this?
Most have some sort of led light that narrows down the problem.
If not at least do these things:
make sure the power is off, and that the blower motor spins by hand freely.
next if you have a volt ohm meter, you can test the plug to see if there is a circuit, if the glow plug is open, that is one problem,
If you have a volt meter you can measure the leads at the plug to see if voltage is there or not.
There are so many checks and switches that will operate dependent on the operation of something else.
Unplug the furnace and keep the power off the brain, if so equipped for several minutes, see if it resets.
If it does great, if not tell me if there is a brain box and what the lights are, and what the matrix of light codes say, and we can go from there.
You can also measure for voltage from the thermostat to the furnace and make sure it is getting a signal on all wires, a thermostat wire could have come loose.
very difficult to troubleshoot a furnace when one is in front of it, let along without seeing it.
If you find no box, let me know, and let me know from these checks above if anything changes, or gives you more info to pass on to me.
Step at a time we can find this, a volt ohm meter will be really helpful.
Posted on Nov 22, 2008
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