20 Most Recent Honeywell L4064B2236 Fan/Limit Control Heater - Page 8 Questions & Answers

l641a1039 USE L641A1039 CYLINDER STAT. The part number has been updated.

Honeywell... | Answered on Jan 13, 2019

Some context might help. Was it working before but now has this error? If you're just installing it, had you connected it to your wifi and have the app running or .. That initially strikes me as an incorrect wiring error but, not sure how or when you're getting it.
You might want to give us some more detail to work with here.
Additionally, you might want to visit this Honeywell Support page for info as well. > https://www.honeywellhome.com/supportsearch?br={489B8F52-15F5-49DD-B283-40D30099A3A1}#q=Wi-Fi%207-Day%20Programmable%20Thermostat%20%28RTH6580WF%29

Let us know if this helps.

Honeywell... | Answered on Jan 10, 2019


Honeywell... | Answered on Jan 10, 2019

For the T6 Pro model, I found the installation manual; search for 33-00181.pdf. I pressed Menu and + for 3 seconds to get into Advanced Mode; then Select to enter ISU ("Installer Setup"); then Select several times to get to option 425 (Adaptive Intelligent Recovery). I then pressed "-" to make the setting zero (OFF); then pressed HOME to save the setting.

Honeywell... | Answered on Jan 04, 2019

wrong temp? what temp is it showing? it is possible you dont have the time set properly so you are currently in your "sleep" period or wrong time period.

Honeywell... | Answered on Dec 16, 2018

If you are not sure of your system type or if you have other questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems.
It will NOT work on multi-stage heat pump systems or
120/240 Volt systems. Call for help

Honeywell... | Answered on Dec 12, 2018

This took about 10 seconds to find,
To purchase a new replacement Heating Bulb, please contact our
consumer relations group at 1-800-477-0457 for cost and shipping detail see page 2 of your instructions that came with unit.. You can also look on line for hz940 parts.

Honeywell... | Answered on Dec 11, 2018

The Honeywell RTH230B indicates that the system is running the overnight (sleep) program with the 4 inside the house symbol. When the house flashes, the desired temperature has been changed from that programmed temperature (bypass mode). The bypass mode should only run for 2 hours.

The default programming starts the sleep period at 10 P.M. and ends at 6 A.M. On the original program in the thermostat, the temperature target was set to 62 during the heating season and 82 for the air conditioning season.

Since the thermostat was set to bypass, you should check who in your house pressed the Up/Down buttons on the thermostat to change the house temperature. Beyond that, check the start and end times and the programmed temperatures for each scheduled period. Honeywell has the manual for the RTH230B here: https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1800.pdf .

I hope this helps

Cindy Wells
(On my own programmable thermostat, we recently found that one period in the week had been left at the default setting. Thus the thermostat was programmed to maintain 60 degrees when we wanted 65 during the day.)

Honeywell... | Answered on Dec 10, 2018

That clicking is actually high voltage arcing in the unit. If the mesh is out of alignment or dirty it will arc.

Honeywell... | Answered on Nov 28, 2018

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