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The oil furnace will not start, T-stat is calling for heat, there is power to the primary control

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Hello Check the burner motor itself for a red button and see if that pooped up.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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I have a Armstrong SX80 gas furnace, T-stat calls for heat, combustion fan starts, in 1 1/2 min burner lights,this month t-stat calls for heat, combustion fan starts no burner ignition,


Check pressure switch and hoses to it . check air filter is clean . check you have gas in the line . check connections on gas valve check flame sensor

Dec 05, 2017 | Heating & Cooling

1 Answer

Coleman furnace. Why no heat?


Oil or gas? What model t-stat? Any recent events like household power isues, t-stat replacement (or needs/replaced batteries), basement flood, home renovation? To state the obvious, it's either not receiving a call for heat (controls,wiring) or not sending (t-stat or wire).

Apr 09, 2016 | Heating & Cooling

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Furnaces starts on its own thermostat is off.


sounds like your thermostat is not working like it should. check to see if any wires are loose or broken

Jun 16, 2014 | Atwood 34,000 BTU 8500 IV Furnace

1 Answer

Power vent on oil furnace keeps running


The vent motor starts with a call for heat from the thermostat. They are actuated by a separate relay that may be arched closed. Kill all power, turn the stat way down and turn the power back on. If it starts when the thermostat is NOT calling for heat, find and replace the relay.

Nov 25, 2013 | Heating & Cooling

1 Answer

Carrier Furnace won't start up


Sequence of events: call for heat at T-stat, inducer motor turns on, negative pressure created in heat exchanger closes pressure switch, pressure switch control wire runs through all safety's (these must all be in closed/safe position) if ok then glow plug lights. Time delay then gas valve opens, flame verified by "flame rod" t-stat = :)

Apr 22, 2013 | Heating & Cooling

1 Answer

Comfortmaker furnace model GUH075 requires resetting for flame to light?


Is this an oil or gas fueled furnace? All heating appliances have several safety switches in the controls. Flicking the on/off switch (assuming you mean the emergency toggle switch) is not resetting the burner. If you pressed a button near the red light,that MAY have been the primary control reset.
Your problem could be anything from the main power switch to one of the many controls with a wiring or sensor issue. Or even a t-stat wire problem.
Regardless, a thorough technician should be checking the entire circuit, from the t-stat to every control in the circuit. Including every wire.
Lastly, a qualified licensed technician should never diagnose without being in front of the appliance. Hope this helped :)

Jan 30, 2013 | Heating & Cooling

1 Answer

Out thermosat for our furnace and air conditioners will not work. There is no poweer going tot he thermostat at all.


Hi, if you have no power to the stat, go to the furnace if this is a split system. Depending on the year you have, this unit may have the main circuit board with a 3 to 5 amp control fuse plugged into it. If this is what you have, check this fuse, it is the same as the fuses in your car. If you don't have this circuit board, locate the transformer where your thermostat wires come in and check for power at both the 120 volt primary side ( power in ) and see if you have 24 volts coming out of the secondary side of it. If no power in, check the circuit breaker to the furnace. If there is power in and nothing out, the transformer is gone. Check close for any breaks in the stat wires at the furnace also. I may need to have the model and serial numbers, and if its a split gas fired or a heat-pump unit if this information does not apply to your unit. Let me know.
Shastalaker7
A/C, & Heating Contractor.

Mar 11, 2011 | Coleman Heating & Cooling

2 Answers

Furnace wont start when thermostat sends signal


by restart button you mean reset i believe,its located on top of oil burner and says only push one time .if thats the button your pushing it is the reset button or retry for oil burner if you are pushing this there is a problem with burner

Jan 04, 2009 | Honeywell Electronic Programmable...

1 Answer

Carrier Heating furnace


either the gas at the outside valve is off, or the gas valve at the furnace may be off, or the switch on top of the gas valve in the furace may be off. if they are all on, then you may not be getting a call for heat from the stat to the furnace control board. check to see if you are getting a 24 volt signal from the stat to the w terminal and common terminal on the furnace board. if you are then check to see if the voltage is arriving as 24 volts to the wires at the gas valve itself . if it is then the gas valve is possibly bad. if it is not then the board is possibly bad.look for loose or broken connections on the low voltage wiring. most unusual that the board does everything else but send power to the gas valve. you need to zero in on the valve i think and start by turning off power and that should restart the sequence of operation and you can observe it step by step . if you are not getting a call for heat then the stat may be bad be sure you are in heat , fan in auto and temp pushed up to max. if no 24 volts is sent to furnace board white and common low voltage board then stat is bad. remove it if you think its faulty and jumper the white and red wires together on the subbase. that duplicates what the stat normally does. if the furnace lights its the stat. having said that i realize the stat has to be sending a heat signal or the other stuff would'nt start. so..... back to the furnace board. check that 24 volts in from stat and 24 out to valve and that will put you on your problem item. good luck

Oct 30, 2008 | Carrier 38BRC048 Air Conditioner

3 Answers

Furnace


I would guess from the info provided that you only have two wires going to your thermostat which would explain why the fan switch doesn't work on the thermostat. You can bypass the thermostat as a first step in troubleshooting. After that it depends on the type of furnace, standing pilot or electronic ignition...

Nov 29, 2007 | Honeywell Power Humidifier: Furnace...

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