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How to fix over heating thermostat, not following auto settings?

I have set the thermostat at my house at set on auto at 21 degree. However since this morning the temperature increases to 26 degrees and beyond and not coming down. The house is quiet warmed up, so please advise on issue and troubleshooting

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  • 484 Answers

Sounds like there is a problem with the a/c and not necessarily with the thermostat. Is the outdoor unit running and discharging warm air? If its running and the air is cool, either the compressor itself isn't running or there is a refrigerant issue.

Verify what the system is doing, then consider contacting a reputable service organization in your area.

Posted on Apr 18, 2015

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Posted on Jan 02, 2017

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SOURCE: need to find out why my honeywell rht4650d thermostat is reading "in recovery"

The problem is likely with the cooling system, not the thermostat itself. Either the message from the thermostat is not being received by the AC unit, the solenoid isn't turning on the unit or it can't cool properly.
First check that none of the wires to the thermostat are loose or broken. You'll have to take the face plate off to check. The conductors are very small wires and can break easily. Depending on the unit,there are 4-5 wires usually for a HVAC system. If a wire is loose, reconnect it (push it in or screw it down gently). If a wire is broken, strip (for screw terminals) a new section and reconnect it. Check for ice build up on the condenser coils. (That is often a sign of a refrigerant leak. You'll need a professional to fix it and recharge the unit.)
Do you hear the fan running? If you do, then the condenser is a likely culprit. If the fan isn't running, then the control board for the system may be bad. You may want a professional to check the system. If you tell them the make and model, the technician can bring the parts if it is a problem with the control board.

I hope this helps.

Cindy Wells
(We had the broken wires to our thermostat in the winter. A few years ago, a nearby lightning strike had the AC off in the summer due to the control board damage. The house reached 90 degrees while we waited for the repair.)

Posted on May 31, 2013

  • 3368 Answers

SOURCE: I changed my wireless setup and router, now the thermostat says connection lost, I followed the instructions to reset but the WiFi set up doesn't come up How do I reset the Wifi I have the RH

Be sue the router is on and is not blocking it.

Posted on Dec 18, 2014

  • 173 Answers

SOURCE: I have a Honeywell programmable thermostat and I

I would say that the problem is in the furnace, not the thermostat. The Thermocouple or other temp sensor needs replacing, the sensor that tells the furnace that it is heating. It just keeps turning off and trying again in 3 minutes cycles.

Posted on Jan 01, 2015

  • 90 Answers

SOURCE: I install 2 new honeywell non programmable thermostats. The temp never reaches the setting temp. Always 5 to 8 degrees off. I can not get the furnace to heat the home over 70 degrees. Even set at 80.

If the furnace is cycling on and off and not reaching temp there is a problem in the control circuit. If the thermostat is not satisfied the furnace should be running without shutting off in which case the capacity of the furnace is inadequate because of size or problems reducing the capacity. This could be caused by an increase in home size, poor air flow (dirty filter, loose fan belts, fan running slow, obstructions in the duct), dirty heat exchanger or burner, reduced gas flow, over temperature switch bad causing the burner to shut off early, or a few more technical reasons. You may do well to call a technician to troubleshoot this problem.

Posted on Feb 09, 2015

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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

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Adjust thermostat


A thermostat only cuts the heating off when the temperature it is set to is reached while the heating is on. If the heating is set to off then the thermostat will do nothing.
Generally you want to think about when you want your heating to come one and off by using the timer and then the thermostat is just used to ensure that you don't waste energy by exceeding the maximum comfortable temperature.

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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.
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1 Answer

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1 Answer

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Friend! All thermostat is calibrated to cut in and cut off at the end of - or + 1 degree end.
Example: If you set 23 degree, it will cut off in 21 degree and cut in @25 degree. So accordingly you set the temp.
Secondly, don't set temp near to your room temp.Minimum difference should be 3 degree. If your room temp 12 degree, set at least 15 degree for heat and if room temp 28, set at least 25 degree for cool.
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Jan 02, 2011 | Heating & Cooling

1 Answer

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Is the thermostat set up for automatic change over from heat to cool? If so, the heat is probably set for 75, you will need to lower the heat setting in order to Lower the cooling. the stat won't let these settings with in 2 degrees of each other so the heating and cooling don't fight each other.

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