Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Honeywell Gas Furnace
A Make and Model number of the furnace not the thermostat will help but I can walk you thru the operation of a typical furnace. It sounds to me that the burners are igniting properly but the flame sensor is not sensing the flame and shutting down the system. You will need to find the sensor and clean it and check the wire from it to the control board. Typically, the flame sensor is found at one side or the other of the burner box. It is a small probe that the flame hits. Depending upon your model it may have a small wire attached to it leading back to the control. Or it may be part of your auto-pilot assembly. ? At any rate, you will need to get to it and very delicately brush it off. Then inspect the flame channel. This is a trough area where the flame travels to ignite all burners. Over time, they tend to fill with rust and debris. Take a small screwdriver and run the blade down the trough. Inspect the wire that goes from the flame sensor to the control board. Make sure it is not frayed or broken or shorting out and that the connection at the board is good.
Beyond that, it's time for a technician to come.
Let us know the Make and Model of the furnace (found inside the furnace cabinet) and maybe we can help you further.
Posted on Nov 20, 2007
Could be a couple things. First and easiest is to check your intake combustion air supply. If it is blocked by anything or just not enough flow, it will put out the flame. Next would be the flame sensor, usually a temperature probe near the flame front. If it's not reading an increase in temp within a pre-programmed time, it will kill the flame. It can be checked with a multimeter.
Posted on Jan 25, 2008
Induced Draft Motor Will Not Run
On furnaces with an induced draft motor, the motor must first come up to speed creating a negative pressure for the pressure switch. This switch must only be closed after the induced draft motor comes up to speed or the motor will not start. If this switch is jumpered (bypassed by the technician) prior to a call for heat the furnace unit will give an error code of “pressure switch contact failed in the closed position”. If the motor does not start check for induced draft motor wheel stuck or seized, lack of 115-volts to the induce draft motor, bad start capacitor on induce draft motor, defective inducer motor.
Posted on Oct 27, 2008
If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.
Posted on Jan 06, 2009
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