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Old 08-05-2022, 03:06 PM   #1
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Question Furnace kicking on unexpectantly

Hi -

We have a 2017 MAC 208. This past year we have had to use the furnace. It has worked pretty well when needed.

However, on the nights that we don't need and we have set the thermostat to off we have noticed that if drops into the 40s the furnace will kick on unexpectantly. My first through is that the thermostat might be problematic, but it is working when needed.

Has anybody run into a similar issue?

Thanks!
Shawn
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Old 08-05-2022, 04:36 PM   #2
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Sounds like Off is not really off rather "Who would want it that cold"

Seriously though it would depend on if there is an actual cutoff switch in the thermostat and if so, is it working?
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Old 08-05-2022, 05:59 PM   #3
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I’m assuming you have turned it off until it locks in place?

https://youtu.be/wm_TBWnTsUU
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Old 08-06-2022, 07:58 AM   #4
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Quote:
Originally Posted by dalford View Post
I’m assuming you have turned it off until it locks in place?



https://youtu.be/wm_TBWnTsUU
X2

Pushing the lever, one must be sure to go past the low temperature detent and lock it to off.

It only goes a tiny bit into the off position but it takes a little more force than just sliding the lever.
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Old 08-06-2022, 05:04 PM   #5
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Quote:
Originally Posted by denverlynx View Post
Hi -

We have a 2017 MAC 208. This past year we have had to use the furnace. It has worked pretty well when needed.

However, on the nights that we don't need and we have set the thermostat to off we have noticed that if drops into the 40s the furnace will kick on unexpectantly. b
Has anybody run into a similar issue?

Thanks!
Shawn
Posts by Dalford and 5Picker have given you the correct answer.

Be aware that these old-style mechanical thermostats are very robust. Nothing ever goes wrong with them. It's the new electronic thermostats that can cause problems.
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