Question about Honeywell Programmable Thermostat Heater

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Flashing battery symbol

We just replaced the batteries in our Honeywell RTH230B controller.  
I did not turn off the Heat/Cool switch before removing the old and reinstalling the new batteries.
Now, with the new batteries installed, the battery icon is flashing and the controller won't turn on our pellet stove.  I checked the battery voltages and the new batteries are fresh.
Is there some type of reset button I need to press to clear the low battery error?

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I had this same problem today.  I called Honeywell and they said the flashing broken battery symbol may mean low batteries, or it may mean the battery type is incorrect.  They recommend only non-rechargeable alkaline batteries.  I was using rechargeable NiMH batteries.  Even though they were fully charged, I had the flashing battery symbol and the thermostat relay would not work.  I replaced with alkaline, the flashing battery indicator went out, the thermostat works again.
Odd that it worked for 3 months on the rechargeables after first install. I did notice the broken battery symbol came on after the first few days, but I checked the battery charges and they were good, so I disregarded the symbol until the thermostat stopped working today.  Apparently there is something about the NiMH performance characteristic that the thermostat doesn't like.

Posted on Feb 18, 2009

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Clean the contractor with pencil eraser then put batteries in backwards for 15 seconds and then reinsert them properly. This fix it for me and hopefully will work for you.

Posted on Oct 07, 2016

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1 Answer

I have a Honeywell RTH6580WF Wi-Fi Thermostat that has "Cool On" or "Heat On" flashing in an endless loop. Could there be a major issue?


Pull the power red wire off the thermostat and batteries out if it has battery backup, then reinstall...much like a computer restart. If this doesn't work, then replace your thermostat.

Jan 21, 2016 | Honeywell RTH6580WF Wi-Fi Thermostat

2 Answers

The unit keeps flashing


By unit, do you mean the thermostat? And if so, do you mean the whole face is flashing, or just a heat or cool symbol? And if your talking about the heating/cooling unit, are you talking about a flash on the board?
A thermostat face that is flashing is usually batteries.
A symbol that is flashing on a thermostat indicates a call and is in a delay. There will be a 5 minute delay on calls if the call has been short cycled, powered off and on, etc.
If the symbol continues to flash for an extended amount of time, then the problem is in the furnace, air handler, etc.
If the system is working, but flashing, then it could be the programming of the thermostat.

Dec 02, 2013 | Honeywell Thermostats

1 Answer

I installed a Honeywell RTH230B model thermostat. The heat works fine, but the AC is blowing warm air. Wires from old system are as follows: Y=yellow; G=green; R=red; O=brown; C=blue; E=white (it looked...


the colors of old system are for heat pump.if you have a heat pump you need heat pump thurmostat and colrs will make more sense.if not,then you need to go into furnace to see what colors go where.yellow is cool, goes to compressor contactor,usually another wire going from furnace to outside unit.green is fan relay rh is heat call rc is cool call

Jan 01, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Batteries died on my honeywell RTH230B replaced but furnace won't


you will have to reprogram it according to the operating manual.
The manual is available on www.manualnguide.com

Feb 02, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

My honeywell RTH230B won't do anything. I put fresh batteries in it, tried everything and nothing happens. What is the probelem and what can I do?


If this is a typical air handler unit then turn the fan switch to on, if the fan does not come on then you have a control problem or no power to unit. Check fuses/Breaker.

If fuses and breaker are ok then try this. Turn the power off to unit, try and locate control board usually
located in the lower panel where the blower might be.

Disconnect thermostat wires that go to probably
r/w/g/y/c and remember what color goes to where.
If you can make a jumper wire or you have aligator
clips, jumper r and w. Put door back on, turn power on and heat should start up.

You can also put a jumper between r ang g terminals
instead and the fan should come on.

If either of the two cases happen, then you need another thermostat or check wiring to thermostat.
Another possibility is that there could be a car fuse
located in the control board that is blown

Good Luck

Jan 12, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

Rth230b honeywell display screen faint


Mike, The static electrical spark probably 'zapped' the Rth230b Honeywell Display unit. If you have already tried removing the power (batteries) from the unit and after waiting several minutes; reapply the power (batteries). If the problems remain unchanged, then it is time to replace the Display unit with a new one. The static electricity problem is problematic and the only way to prevent the same problem from recurring is to discharge yourself before touching the Honeywell Display. As you walk across the room which (probably has carpet), causes the static electricity to build up on your body and then discharges itself through the Display unit when you make contact with the Display unit. You might try coming to a complete stop and attempt to discharge the static charge on your body by touching the wall first with one hand for a second before touching the Display unit with the other hand. Naturally, cold weather with low humidity makes the static electricity worse. Hopes this helps you. Henry

Feb 04, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Model RTH230B uses a lot of batteries


THIS TYPE has been deemed defective! changeout to a different type.

Sep 04, 2008 | Honeywell Programmable Thermostat Heater

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