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The furnace acts like it's going to kick on, but just shuts off..

We keep getting the alert on our furnace that means ''combustion air switch failed to close''

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Make sure there is nothing in the flue or intake air pipe. make sure tubing to the pressure switch is clear and that the combustion blower motor is running. If all these are okay the air switch may be bad.

Posted on Oct 05, 2009

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1 Answer

Can i hook up a thermostat to my hot blast wood/coal stove to control the heat in my home


Yes, you most certainly can. It depends on how handy you are and to what extent you are willing to go to make this happen. A lot will depend on how comfortable you are with electrical wiring and understanding HVAC controls and their function.

First though, this is the typical way a wood fired forced air furnace is designed to operate. There is a control transformer and relay to control either a combustion air fan (that you do not have) OR a motorized damper for combustion air that you also do not have. The relay closes on a call for heat from the thermostat and opens the damper from its minimum position to allow combustion air into the firebox. As long as there is solid fuels (wood) in the heat chamber, the fresh supply of combustion air will allow the fire to burn or begin to burn very quickly.

As the temperature in the wood furnace plenum increases, the automatic fan control will start the fan and it will run as long as the bonnet temperature is higher than the fan'on' setpoint on the fan control... Now the house warms up and the thermostat satisfies which allows the combustion air damper to spring back to the minimum position, causing the hot fire to die down due to lack of combustion air.

The now smoldering fire will not generate enough heat to keep the fan running too long, so the automatic fan control shuts the fan off until the house cools approximately 2 degrees below thermostat setpoint. The thermostat calls for heat and opens the damper and on goes the cycle....

An important item to remember is that on the automatic fan control, there is a 'limit switch' function. The motorized combustion air damper or the combustion air fan must be wired through the limit switch in case the bonnet temperature exceeds 200 degrees F. This function will then allow the damper to go to the minimum position or the combustion air fan to go off, causing the fire to cool down due to lack of adequate combustion air.

You don't want the thermostat controlling the circulating fan directly, because of two things: 1). If the fire is out, there is no heat to circulate but the thermostat wouldn't know that and it would start and run the fan continuously until a fire is built. and ....
2). You would still be running up and down the stairs monitoring the fires burn rate by opening and closing the lower door manually.

ALL the components you need are readily available from WW Grainger....basically : a fan/limit control
a thermostat
a 110v x 24v 40 va control transformer
a 24v spdt relay
20 ga. two conductor thermostat wire
24v actuator and linkages to mount to the existing combustion air damper. A bit of creativity is required here. I would not recommend retro-fitting a combustion air fan.
14-2 wg romex for wiring the fan control

Again, it depends to what extent you are willing to go to achieve the end result. Will it be exactly like a new system?? No, but it will operate a lot better than that which you describe.

Oct 24, 2014 | Home

2 Answers

Furnace kicks out every so often, ran for two days this time, then kicked out on a pressure switch open, i have replaced the combustion motor ,pressure hose ,and pressure switch, runs for a while then...


You are going to need a service man. A magnehelic gauge is needed to properly diagnose a pressure switch issue. Could be a blocked or restricted flue, a defective induced draft motor, cracked heat exchanger, restricted secondary heat exchanger, ect. ect.

Feb 21, 2014 | Intertherm 56000 Btu Gas Furnace

1 Answer

Why is my 95% rheem furnace blinking code 2


Check condensate water /drain stopped up. It will allow a start after a reset but then it shuts the combustion air fan down and that shuts the unit down this will require a service tech make sure their familiar
with 95% units

Oct 19, 2012 | Rheem Gas Furnace 60000 Btu 95% Afue. Rgrc...

1 Answer

Combustion Air Switch Failed to Close


I have this furnace in two of my mobile homes. In both I had to take off the inducer motor (i think that's what it's called)..it has the clear air tube attached to it. Remove the 4 screws or top two if you have small fingers and give the wheel inside at the bottom a push. These tend to stick over years of use and in both cases once freed the furnace came on. I too had 3 flashes in both cases.

May 09, 2012 | Coleman Propane Forced Air Heater...

1 Answer

Rheem 90+ NG Furnace. When furnace starts, draft inducer starts, ignitor glows and gas ignites. Burners stay lit for 10 seconds or so, then the flame reduces for a few seconds then goes out. Main blower...


Check the draft inducer air switch ( vacuum diaphragm switch) If the switch is opening when the burner starts, you might have a blockage on air piping coming into the furnace. Also prime the condensate trap on the condensate drain from the combustion fan. Also check the gas pressure, if your gas pressure is dropping, the gas pressure switch will shut it down. If it's too high the moment it comes on could raise the pressure in the furnace dropping out the combustion fan proving switch.

Oct 29, 2010 | Electric Circuit Breaker Kit for Furnace

1 Answer

Heater flashes 3 times says it means combustion switch failed to close


Combustion switch is your vent safety.. Check your vents outside for blockage, sometimes the intake pipe will freeze or frost up not allowing the preassure switch(vent safety)to close. putting furnace into a lock out.. you can reset the furnace by turning the power on and off.. if there is no power switch just remove the bottom door and reinstall...

Jan 08, 2009 | Coleman Propane Forced Air Heater...

2 Answers

Furnace shuts off


Defective combustion air switch. The 3 blinks are an error code. You didn't say, but I'm guessing you have a Coleman Evcon. They had alot of defective Combustion air switches. Your specialists were not that.

Jan 05, 2009 | Coleman Propane Forced Air Heater...

2 Answers

Furnace won't stay running


1
1 FLASH
Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
sensor.
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
performance.
• Locate and correct gas
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
igniter.
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
• Verify proper induced
draft blower performance.

Nov 23, 2008 | Goodman GMS90703BXA Heater

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