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Heil DC90 gas furnace need to find reset or limit switch

I have a heat exchanger problem and no money for repairs until Jan. Short term solution is to hit rest(limit) switch. Cannot locate switch.

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How does it work


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Jan 14, 2016 | Thermostats

1 Answer

I install 2 new honeywell non programmable thermostats. The temp never reaches the setting temp. Always 5 to 8 degrees off. I can not get the furnace to heat the home over 70 degrees. Even set at 80. Any...


If the furnace is cycling on and off and not reaching temp there is a problem in the control circuit. If the thermostat is not satisfied the furnace should be running without shutting off in which case the capacity of the furnace is inadequate because of size or problems reducing the capacity. This could be caused by an increase in home size, poor air flow (dirty filter, loose fan belts, fan running slow, obstructions in the duct), dirty heat exchanger or burner, reduced gas flow, over temperature switch bad causing the burner to shut off early, or a few more technical reasons. You may do well to call a technician to troubleshoot this problem.

Feb 09, 2015 | Thermostats

1 Answer

Honeywell thermostat will not work when put on automatic


Depends on what type of heat you have...if it is electric, it could be your thermostat (some electric heaters use contactors & rely on the thermostat to switch the fan on). Heat pumps also use the thermostat to switch the fan on in heat & cool mode. Most electric furnaces use a sequencer to switch the low speed of the fan whenever there is a call for heat. Gas furnaces use either a fan/limit controller (if the unit is older) OR a circuit board based on time (after the thermostat calls for heat). SO depending on the type of system you have, it could be a bad sequencer, controller, relay, thermostat, or control board. Hope that helps.

Dec 17, 2013 | Thermostats

1 Answer

My honeywell thermostat will not let the fan blow if it's on automatic


Depends on what type of heat you have...if it is electric, it could be your thermostat (some electric heaters use contactors & rely on the thermostat to switch the fan on). Heat pumps also use the thermostat to switch the fan on in heat & cool mode. Most electric furnaces use a sequencer to switch the low speed of the fan whenever there is a call for heat. Gas furnaces use either a fan/limit controller (if the unit is older) OR a circuit board based on time (after the thermostat calls for heat). SO depending on the type of system you have, it could be a bad sequencer, controller, relay, thermostat, or control board.

Dec 17, 2013 | Thermostats

1 Answer

Rth230b blows cold air when set on heat


If this is a gas fired furnace, their could be a manual limit needing to be reset...if you reset it, & it happens again, you need to call someone to check out the problem

Nov 25, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Gas furnace blower fan will noy shut off. looked for reset switch but do noy have any visible switch.


sometimes they put in a high limit and when it opens the blower comes on and stays on. hope this helps.

Oct 04, 2011 | Honeywell Programmable Thermostat Heater

2 Answers

Fan blows but no heat/fan won,t shut on and off in the auto mode


Certain gas furnaces will default to high speed fan ON any time a high temp limit opens or the 24 volt transformer fails. Please respond to describe your make of furnace and if the fan runs only when your thermostat calls for heat or if that makes a difference.

Dec 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Blower stays on with new themostat


Check to see if there is a short between the green wire and the red wire. Green is the fan control wire for AC. Sounds like some wires may be touching. How did the old t-stat get fried?

Jan 02, 2009 | Honeywell Programmable Thermostat Heater

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