Heater stops blowing hot every few day

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Old 02-17-19, 11:47 AM
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Heater stops blowing hot every few day

New home owner and like doing stuff myself. Heater/ac is on the roof, it will work fine for 3 or 4 days and then it will stop blowing hot. Only way to get it to blow hot again is to shut it off at the breaker and turn it on again. Iv made sure the filter is clean, replaced it, and even tried running it without one. Iv inspected the internals and nothing seems out of place or making odd noises. The only thing that seems weird is it looks like the limit switch has been removed. Either that or I just cant find it. There's a pic of the spot where it looks like a limit switch should be and isn't. Any ideas would great.
 

Last edited by PJmax; 02-17-19 at 08:51 PM. Reason: removed links
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Old 02-17-19, 11:58 AM
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What is the source of heat? Is it a new home or new (old home) to you?
 
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Old 02-17-19, 12:32 PM
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It's a gas heater. Home was built in 1973, it's new to me.
 
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Old 02-17-19, 12:35 PM
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What site are those pics hosted on ? I might be able to grab them.
The site won't allow tiny pic links.
You can post them here directly...... How-to-insert-pictures

Sounds like a packaged unit. A make and model number would be helpful.
 
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Old 02-17-19, 07:49 PM
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Hopefully this work. I'll get a make and model in the light tomorrow.


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Last edited by PJmax; 02-17-19 at 08:56 PM. Reason: cropped/resized/labeled pictures
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Old 02-17-19, 08:59 PM
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You only have a limited amount of storage and you used it all this post. I resized your pics to maximize storage.

I labeled the rollout switch. Is there not a switch there ?
You'll see an orange arrow pointing to the pressure switch tube. Remove that tube from both ends and clean the hole in the inducer blower. It's a tiny pinhole down inside the hose fitting. Make sure the tube is clean too.


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The intermittent ignition systems are problematic on packaged unit too because of the weather.
 
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Old 02-18-19, 10:07 AM
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Thanks for the labeling that really helps. Yea I think the limit switch has been removed or deleted previously. Not sure why. I need to read the wiring diagram and try to follow the wires back. I'll clean the pressure switch and tubing and check back
 
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Old 02-18-19, 10:11 AM
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If what I labeled as the rollout switch is missing...... you mostly likely have a problem there and it was removed. It is vital that it be in the system.
 
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Old 02-20-19, 09:27 AM
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No the rollout is there. I believe the limit switch is missing.
 
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Old 02-20-19, 01:49 PM
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You'd have to point it out..... or where it should be.

A rollout switch is a limit switch. There could be 2-3-4 other ones in your furnace.
If the switch was missing..... the wires would have to be connected together as they form a loop.
 
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