Question about Heating & Cooling

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Got a problem with my house central heater, the unit is inside the house, don't know the brand , but the problem is that when I turn it on to warm up the house, it comes on for a few minutes then before reaching the desired tempeture, it turns off, sometimes I can see the igniter gloss bright, but the gas valve does not open, I alredy replaced the wall thermostat but that did not solve the problem, any ideas? Thank you.

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  • dklmn66 Apr 09, 2011

    when the flame goes off, the fan still works, so, when the heater goes off , without reaching the set tempeture it's only the flame that turns off, not the fan ,which still blows , but not heat, this heater does not have a pilot ,it comes on with an igniter, wich glitters bright orange to ignite the flame when the gas valve opens, now, when I first turn it on, it comes on, the igniter comes on, then the gas valve opens and the flame comes on , the fan comes on and starts blowing warm to hot air thrugout the house( 2 story house) then after just a couple of minutes the flame goes off, but the fan keeps working, and sometimes I can see the igniter trying to lit the flame, but the gas valve won't open, Ialready replaced the air filter, wich was very bad, installed a new filter , and also replaced the thermostat, but still with the same problem, (just FYI ,also ran a self test on the main board (electronic board) and everything seem to be ok).
    thanks.

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I have a couple of ideas, but they will probably involve getting a service tech to look at these. First the gas valve may be bad, thats why it is not openeing after the igniter is coming on. Second the control board that controls the gas valve may be bad and not calling for gas when it should. At least part of this is working, you get the igniter and the blower but no gas, that makes me believe the gas valve would be the main suspect here. I assume you have good gas service and it has not been interupted. If it is working a little sometimes, I am not sure by your statement, then this model may even have a thermocouple involved for flame temperature and this may be bad. I would have to know much more detail on the make and model along with the gas valve manufacture to give you any more on this. But If this were me I suspect the gas valve and a tech would have to read the valve with a meter to determin if it is bad.
If you have a volt ohm meter you can see if your getting any voltage in DC current to the gas valve, that would tell me if the board is bad.

Posted on Apr 09, 2011

  • Dcramer531
    Dcramer531 Apr 09, 2011

    Ok, I did not see the previous answers or added information till now, so with that being said. The problem seems to lie with the pressure switch that tells the main board that the combustion fan is running, or the flame temp sensor that I had mentioned. I still need more info along the lines of the manufacture so I can see how they have things set up, but I think I narrowed it down to these 2 items.

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Hidklmn66,

I have a general troubleshooting for most central heater issues. These includes checking on the parts that may cause the problem that you are getting. Before doing any checking with your machine please remember your safety.

1.On your main service panel check out if there's a blown fuse or tripped circuit breaker. Replace any blown fuse or if the breaker is tripped reset it, depending on the type of your system.

2. Inspect the air filter. There must be proper air flow and any obstruction can cause your system to work less efficiently.Replace a dirty air filter with a new one or clean a reusable air filter.

3. Look at the compressor unit outside. There might be surrounding vegetation that obstructs the quality of air flow. Sometimes there are foreign objects that has fallen into the unit and affects the ability of fan to rotate. Remove any object obstructing the fan. Do not attempt to straighten out a bent blade because even minor damage to the blade can adversely affect performance. If the fan has damaged blades, replace the whole fan.

4.Make sure that the fan is not frozen as well. Try moving the fan by hand, if it's difficult to move, lubricate it. You have a user manual where you can the instruction how to do it and what type of lubricant needed.

5. Check the tension on the fan belt. Check if it's too tight or too loose. Pressing down on the belt should result in the belt giving between 1/2 inch and 3/4 inch in slack.

6.Is there any damage to the fan belt like tears or cracking? If there is, then fan belt needs replacement.

7. Pilot light should be lit on a gas system. If it won't stay lit, you have to turn the adjustment screw so that the flame burns strongly enough to stay lit. If the pilot light won't come on at all, turn off the power to the heater and clean out the pilot orifices with a toothpick.

Hope it helps.

Thank you for using Fixya.

Posted on Apr 08, 2011

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Hi, the unit will not run and perform optimally if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Apr 08, 2011

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