One thing I would check is the capacitor. The older units have a cylinder-looking capacitor which can be checked out visually most of the times" if the top is now a dome, as opposed to flat, then it needs replacing. Otherwise, it needs to be checked with a meter that measures capacitance. If you don't have one, you might need a real AC guy. Most electricians won't touch the insides of an AC unit. All they are good for in this instance is in making sure there is power to the unit, which you said there is.
If it is flat, consider that an option for later - check what you can. It could be as simple as a reset switch, which is what you should check first.Sent: Sunday, February 19, 2017 6:08 PM
To: DoIt_Yourself@yahoogroups.com
Subject: [DIY] Help me troubleshoot gas furnace
Hi there,
I have a Carrier model furnace in the attic circa 2001. About a week ago, it stopped working. (Fortunately in California, the nights only dip down to the mid-low 60s, so it's more of an annoyance than a necessity.)
Here is the info I gathered:
1) The water heater and oven still work fine.
2) The thermostat still appears to be working. The fan controls work (on/off) and the AC works.
3) When I set it to heater, the thermostat indicates its own. But you don't hear the typical noise from the ducts and no hot air blows out.
I haven't gone up in the attic yet, as we have somethings in the closet that will require moving in order to get a ladder to the access panel. So I want to gather all info and see what else I need to do first.
I've read that it could be:
1) The ignitor needs to be replaced, nice and simple
2) Faulty wiring on the board
3) Dirty filter needs to be cleaned
4) A limit switch was tripped and got stuck, so the system needs a hard boot (flip the breaker)
Any other ideas before I venture up there?
Thanks!
Mike
Posted by: Ron Johnson <l0c0l0b0@hotmail.com>
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