Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater
The furnace will kick on, after about 10 seconds kick off. The t-stat is brand new and we thought it was the old one so we changed that. Everything on the t-stat is hooked up perfectly and the furnace is making an odd sparky sound. Never done that even when it wasn't working. The fuse is good and the igniter is new...any suggestions.
Sound like the flame sensor is dirty,bad,or out of place.
Also,check and make sure the gas valve is working,You will need to watch the burner as it calls for heat,If you get a flame then the valve is working,No flame means either gas valve is bad,shut off or not being sent signal to open.
Posted on Jan 28, 2009
Check your manual for your t-stat to be sure that it is set to your type of heating system, this is usually the cause. In the manual for the t-stat, it has settings for your type of system. You state furnace, that means it blows warm air, a boiler circulates hot water. This is most likely the cause of your heating system not operating.
I am assuming that this is a gas system. It sounds as if you are getting ignition, which is good, but not any fuel. I ask that if you are not familiar with gas systems to call a professional, but you can hear if the gas valve opens by starting it up and if you hear a series of clicks and the sound of air coming through, then the valve is opening. It can be a number of things and you will need a multimeter to check the operation of all the connections and relays.
Hope this helps.
Posted on Jan 28, 2009
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Posted on Jan 02, 2017
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Sep 06, 2011 | Goodman Heating & Cooling
Hello, First of all I need to know a little more information. What kind of furnace do you have? Gas or electric? One thing you may do to eliminate the thermostat is to take off the front cover of the stat and jumper the W and R terminals to determine if it is the stat or the furnace. If you do this on the stat and the unit heats up and stays running then you have a bad thermostat. If this does not make the furnace stay on then you have another problem. ( be sure to turn off all power to the furnace before you start working on anything) Please supply more information for further help. J
Jan 27, 2011 | Heating & Cooling
1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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