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bwalters108 03-11-2010 05:34 PM

HEIL 5000 Furnace Problem
Hi All,
Had something of a freak occurrence a week ago. The furnace circuit has a common neutral with another 120v circuit in the house. The neutral opened up due to a surge causing 240v to be applied to the furnace (it blew out a computer too). Of course now that the circuits have been fixed the furnace is not responding in anyway. It was not running at the time of the open neutral so I am hoping that a transformer is simply blown. (Circuit breaker and voltages are ok.) Any thoughts on this?

yuri 03-11-2010 06:08 PM

You may be out of luck. Modern circuit boards are grounded to the furnace chassis and the secondary side of the transformer. Surges can blow circuit boards. Even w/o a neutral there is still a circuit to ground. Sorry.:(

bwalters108 03-12-2010 09:00 PM

Heil furnace problem
Thanks very much for your response. I measured 240 volts at the outlet the furnace was plugged into (before the circuit was fixed). Also thought i smelled smoke when I opened the door to the furnace enclosure. So no doubt 240 got applied to some component of the furnace. So you are saying that it would likely be more than the transformer that got fried and probably includes control circuitry? What would you suggest as a way to test that? Can you recommend where I can obtain parts for this model?

yuri 03-12-2010 09:12 PM

How old is it? Post some pics of it with both doors off. There are LOTS of different versions of Heil/ICPs out there. Where do you live.

beenthere 03-13-2010 04:55 AM

Good chance it took out the transformer, and control board.

Did you check to see if there is a fuse on the board that may be blown.

Get your meter out and start checking componets.

bwalters108 03-16-2010 05:27 PM

Heil furnace 500 problem
2 Attachment(s)
I am located in Placentia, California. Here are pictures of the Heil High Efficiency 5000 furnace. I do not know its age. I measured zero volts on the terminal board (terminals designated as W, Y, R, G & C). The hot (black) 120V lead coming from the house appears to first go to a component that I suppose is a circuit breaker or a fuse. It has a long white spring loaded button protruding from the front of the transformer assembly. I tested the continuity through it and found that it is open in the out position and makes contact in the in position, however the button will only remain in the out position as shown in the pic. It appears to be easily replaceable. I would think this is the first thing that needs to be replaced.

yuri 03-16-2010 06:03 PM

That white button is a door switch to prevent furnace from running w/o the door. That furnace is 20 yrs old or older. IMO it is not worth spending a lot of $$ on because the heat exchanger may be cracked or crack soon. We sold lots of them where I am and only about 10-15% are still in use. I am pretty sure the burners are obsolete. Once a furnace has water damage or a SERIOUS power surge it is unsafe IMO. Critical controls may be damaged and w/o a licensed tech to check everything it is unsafe IMO. Not worth endangering your family's safety.

richiemoe 03-16-2010 08:19 PM

if you are lucky it only ruined the transformer, but it probably got the board

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