I think this is a furnace ?

jCarroll · Nov 20, 2017

We have a 10 year old high eff propane furnace, with heat pump for A/C and secondary heating.
The big deal is the Bryant Evolution System thermostat and zone control equipment.
Temperature control has been within 2 degrees of set point.

But with our recent cold snap (MID-OHIO) I've noticed the room temperature has gotten 4 degrees above the set temperature.
I've read the Install Manual - can't find any user variable settings.

Only idea I have is that the gas valve is sticking open, and the furnace stays lit longer than it should when it calls for heat.
No codes present on the furnace or Evolution panel.

Any ideas?

markct · Nov 20, 2017

Sounds like a bad thermostat or located on a cold wall or such

Cornguy77 · Nov 20, 2017

Thermostat near a drafty door or window

Steve@Advance · Nov 20, 2017

If the gas valve were sticking, I'm sure it would be throwing codes.

If you can, watch it go through a cycle when it is really cold and overshooting. I suspect it may be going into emergency heat (the burners come on), which heats up the heat exchanger, then that heat goes into the room during the cool down cycle.

It's probably doing what it is supposed to do, just the cold weather effecting it.

jeffcat · Nov 20, 2017

On kitchen ovens we call that thermal carry over. If you set your oven for 350? it will have a +- of several degrees. 5hat is why I installed a 1/2inch thick hearth stone fron a pizza oven in 5he bottom of my gas oven. Smooths out the temperatur variables. Same with your house. Now don't start jumping up and dowm. Someone said T-stat. Another said a cold wall. Add drafts , low air circulation, different wind directions, can be a bunch more. Change the battery in the control. See what else others chime in with.

jCarroll · Nov 20, 2017

Thermostat is on an interior wall - not subject to sunlight nor window air leakage.
No battery in main thermostat.

House is on propane heat below 35 degrees. Thermostat tells me when its on auxiliary (propane) heat.

jeffcat · Nov 20, 2017

Crud...well we are trying to figure something. Air filter clean? When was the last time you had the unit professionaly serviced? I also had a problem with the air flow sensor switch on my unit. Factory had gotten a whole batch of them into the production line.
My tube to the outside became frozen. The little water pump couldn't get rid of the water from the combustion chamber of the furnace. It totally shut down the furnace. Nothing like coming home to a 52? house and the outside temp is 23?. I let the little pump run the water into a 5 gallon bucket for the night. This is how I fixed it two years ago. Hose follows the warm flue pipe all of the way till it almost goes outside. Drilled a hole on a tilt and glued in a piece of tubing. Fed the water tube out the flue pipe to the outside. Has worked perfectly two winters now. Here are a few shots of the system. The holders are 3/4 plastic pipe cut on a table saw and glued to the flue with plastic pipe glue. Wrap a couple of ti-wraps around them till the glue sets.
<image src="http://forums.yesterdaystractors.com/photos/mvphoto6493.jpg"/>

mnscruff · Nov 20, 2017

check your zone (temp) sensors for dust, you can use a can of aerosol air for computers to blow the dust out

IA Roy · Nov 20, 2017

Older tstats used to have an anticipator setting. I think that guessed when to shut off the fire. With electronic tstats there is probably no such thing anymore.

WGM · Nov 20, 2017

Here is an original idea: Call the installing dealer.

showcrop · Nov 20, 2017

(quoted from post at 18:34:54 11/20/17) Here is an original idea: Call the installing dealer.

Yeah, they just love to charge $150.00 for a minimum service charge for two minutes even when it is something simple that often times someone here knows about. That is one the best things about these forums.

jCarroll · Nov 20, 2017

House was built - HVAC installed by a HVAC guy who died 7 years ago.
I'm guessing I have the only Evolution thermostat within 50 miles.

rustyfarmall · Nov 21, 2017

(quoted from post at 18:34:54 11/20/17) Here is an original idea: Call the installing dealer.

Yes. I will a fix, or attempt to fix just about anything around the house, but I ain't messin' with a gas furnace.

I think this is a furnace ?

jCarroll

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markct

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Cornguy77

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Steve@Advance

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jeffcat

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jCarroll

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jeffcat

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mnscruff

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IA Roy

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WGM

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showcrop

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jCarroll

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rustyfarmall

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