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My omega ducted heating switches off before reaching set temperature. Will not turn back on unless you turn off power and switch back on only to do same thing again

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Sound like your heat anticipator in your thermostat is out of adjustment, New one comes pre-set.

Posted on Sep 04, 2008

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Bonaire gas ducted heating not reaching set room temperature anymore...


has the system air filters been serviced lately
is the system circulation fab been cleaned to allow full air circulation of the system
call in a technician to check for vermin infestation preventing the system from working properly

Jun 20, 2016 | Air Conditioners

1 Answer

Series 48000 with heat pump we don't want this to run all the time will the heat shut off when it reaches a certain temp also if the power goes out does it come back on automatic we want to heat our place...


Not sure about your particular make and model, but air conditioners are designed to work with a thermostat to control the functions. A properly functioning thermostat will stop the compressor when the set space temperature is satisfied. When the space temperature falls below (heating) the set temperature, the thermostat should turn it back on. In the event of power failure, an electronic thermostat probably will not operate at the previous set temperature when power is restored, but maybe at a higher temperature (but will work).

Dec 05, 2013 | Coleman Mach 15 Air Conditioner

1 Answer

Setting start temperature on central heating thermostat


It sounds like your heating system has to little capacity to heat the home properly. 21 degrees is a reasonable temperature to expect but if the unit is running all the time and can't reach 21 degrees the heater is too small.
As far as setting the thermostat here is a link to the instructions.
http://www.salus-controls.pl/data/product/attach/rt300rf_-_eng.pdf

Nov 22, 2013 | Air Conditioners

1 Answer

Where is the flame sensor on Intertherm MGHA-070abfc-01?


There is no flame sensor per se, unless it has an ignition type pilot. Only temperature activated switches employed.

The limit switch to the left of fan switch is "Nordyne" part #626259. This switch is rated at140 degrees. When the temperature inside firebox exceeds 140 degrees, switch "opens" removing power from the secondary of 24vac xfmr.

The fan switch to the right of the limit switch is "Nordyne" part #626337. This switch closes when firebox temp reaches 115 degrees. Opens at 70 degrees.

At the top to the left of fan is a smaller limit switch, which is a secondary safety switch. The increased temperature within the heat exchanger box activates this switch. It is wired in series with the thermostat wiring.

Hope this info helps.

Feb 05, 2013 | Intertherm Air Conditioners

1 Answer

We have a new a/c and the system has heat strips. For a/c. we have had the thermostat set on AC at 72degrees. Now that it is getting colder and may need some heat in the house, do we switch the...


If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
Hope this helps.
SeagullAC

Sep 15, 2011 | Air Conditioners

1 Answer

At what temperture should you turn it to aux heat and why does my furnace run for hours


It should switch to the aux heat automatically, when it reaches a preset temperature. Usually, when the outside temperature reaches 32 degrees, if it's a heat pump furnace. It can bet preset a little higher though, depending on the unit. If it's extremely cold outside (in the low teens) It may run a lot longer just to keep up. Especially, if you home is not energy efficient.

If your's is not switching over automatically, the sensor switch on the heat pump may have gone pad or the aux heating strips my not be working at all. This requires the service of qualified heat pump service person..

Feb 11, 2011 | Air Conditioners

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I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

Nov 25, 2010 | Air Conditioners

1 Answer

Turned on the furnace last evening to warm things up. When reaching the auto, shut off temperature, the fire/heat shut off OK..but not the fan. Had to shut the power off in order to shut off the fan. ...


Turn the syestem to off-no heat or cool and the fan to auto, turn the power back on, if the fan comes on you probably have a bad fan limit switch.

Sep 08, 2010 | Air Conditioners

1 Answer

I have a central air and heat heat uses gas so when the heat is on should the main fan be turning


Typical systems are designed with a thermostatic "fan limit switch" which protrudes into the heater (house air portion of the passages). The "fan limit switch" is mounted to, and protrudes into the duct within the burner section of the heater.

This switch triggers to fan to turn on only after the air in the duct has reached well above ambient temperature. This prevents the fan from coming on too soon and the system blowing cold air, which people don't like.

Depending on system design, installation and current operating conditions, the time delay from main burners on to fan on can be up to a couple of minutes.

This same limit switch, if the temperature goes high enough, will also turn the gas valve off; a fire safety function.

Jan 06, 2010 | Goodman CKL49AR49 Air Conditioner

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

Mar 28, 2009 | Carrier Air Conditioners

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