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Honeywell RTH8500 thermostat for home, how to adjust temp read by thermostat.now indicating 6 degrees high.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 12 Answers

SOURCE: Inaccurate current room temperature reading

It is not adjustable, sounds like the LED is going bad. Tstat has battery back up for power outages. If you slide the fan switch from auto to on does the blower motor start? If not control problem with unit.

Posted on Jan 22, 2009

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kingbrizzle
  • 407 Answers

SOURCE: I bought a Honeywell RTH8500 thermostat and I can't get the temperature to go down past 75 degrees

You will need the installation book that came with the thermostat. There is a way to enter into the programming of the thermostat from the home screen. From there, you will need to find what code is the temperature settings in the manual, they are usually all 3 digit numbers. Once you find the code for the setting your looking for which is the lowest temp for the thermostat, it will have a 75 to the right of it which you can set a lower number. Sorry I do not have the manual right now to just tell you exactly how, but hope this still helps!

Posted on Jun 10, 2012

  • 5165 Answers

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

  • 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

kingbrizzle
  • 407 Answers

SOURCE: Why does my Honeywell thermostat state temporarily set at 68 degrees? A few days later, it will be set at 62 degrees without anyone touching the thermostat?

It's a programmable thermostat. When you change the temperature, it will say temporary until the next programmed schedule starts or a set amount of time. You will have to program the thermostat to the correct temp settings you wish to have, or you can push "HOLD" after changing the temp to make it stay at that set point. Hope this helps!

Posted on Nov 20, 2016

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You will need the installation book that came with the thermostat. There is a way to enter into the programming of the thermostat from the home screen. From there, you will need to find what code is the temperature settings in the manual, they are usually all 3 digit numbers. Once you find the code for the setting your looking for which is the lowest temp for the thermostat, it will have a 75 to the right of it which you can set a lower number. Sorry I do not have the manual right now to just tell you exactly how, but hope this still helps!

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Read more: How do I Unlock the Digital Display on a Honeywell RTH8500 Thermostat? ' eHow.com http://www.ehow.com/how_7267447_do-display-honeywell-rth8500-thermostat_.html#ixzz17KTxLwBU

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HONEYWELL WEBSITE:
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Your manual is here:
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0653.pdf

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It is not adjustable, sounds like the LED is going bad. Tstat has battery back up for power outages. If you slide the fan switch from auto to on does the blower motor start? If not control problem with unit.

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