Customer Reviews For The Honeywell Home 750 Millivolt Heat Only Non-Programmable Thermostat - CT33A
Overall Rating
Product Reviews
My programmable thermostat quit. I wanted a simple non programmable thermostat to replace it. This thermostat is just what I needed! Only two wires to hook up! Very easy! Remember to take plastic protector clip off when finished!
It came in the mail in a timely manner and easy to install. Thanks.
I really like these simple to use non complicated thermostats. I would like them even better if they did not have an off position for millivolt use.
i love this thermostat because it does not have a heat anticipater. easy to install simple to operate.
Exactly what one would expect from Honeywell. Solid, sturdy, perfectly functional, with simple instructions.
I needed a non-programmable heat only thermostat for a propane direct vent wall heater in a mountain cabin. Easy to hook up with just two wires and works fine.
No more replacing batteries every again. Installation was a breeze. It is very simple to use.
works very well, and was used to replace a multipurpose thermostat that would not turn on gas fireplace
Soooooo glad to get the correct part for my ancient floor furnace. Everyone , box store Pros swore the 24V to millivolt would work. I researched what I needed on the Honeywell site, had it shipped to my home, installed it and we have a happy Warm house again. Thanks Honeywell !
Perfect product for my Natural Gas Stove. Replaced the original on/off wall switch with this unit. Nice appearance, simple installation and appreciated the large back plate to keep the wall clean.
Very good and easy to install
Prompt delivery. Does the job.
Works great
Finally found the product I needed! Service was stellar and at a great price. Kept me informed on product shipment with emails and I received it when it was expected! Keep up the good work!
Truly excellent product. Very easy to install. Works flawlessly and completely accurate with heat settings.
Fast delivery works great exactly what I was needing would definitely order from Honeywell Store again.
My serviceman told me about the millivolt thermostat. He was sure it would take care of my problem. I installed it in ten minutes and it hasn't failed on our gas fireplace. Super fix!!!
Item arrived as described in a timely manner.
easy to install easy to use
Needed old fashioned non programmable replacement for micro volt mercury thermostat without constant power applied. Others would not work this one is perfect.
Product FAQs
There isn't a universal reset for all Honeywell Non-Programmable Thermostats. The process will vary depending on the specific thermostat. However, here are the two most common methods:
Method 1: Power Cycle Reset
- Turn off the power: This can be done by flipping the breaker that controls your HVAC system, or by removing the batteries from the thermostat (if battery-powered).
- Hold the reset button (if present): Some non-programmable Honeywell Thermostats have a dedicated reset button, usually located near the display or behind a cover panel. If your model has one, hold it down for about 5-10 seconds while the power is off.
- Restore power: Turn the breaker back on or reinsert the batteries.
Method 2: Menu Reset (for some models)
- Check your thermostat for a "Menu" button. Not all Honeywell Non-Programmable Thermostats will have one.
- If present, press and hold the "Menu" button. While holding it, navigate through the options (if any) until you find a "Reset" function. This might involve pressing arrow buttons.
- Select "Reset" and confirm the prompt (if applicable).
The CT33A1009 is specifically designed for 750 mV (millivolt) heating systems. This includes gas fireplaces, floor furnaces, and wall furnaces. It is also compatible with forced air (gas, oil, and electric) and hot water/steam systems, provided they are heat-only. It is not compatible with electric baseboard heat (120-240V), heat pumps, or multi-stage systems.
No. This model features a Snap Acting Switch (magnetic switch), which means it does not require leveling to operate accurately. This makes it much easier to install on slightly uneven wall surfaces compared to older mercury-based thermostats.
No. This is a manual, non-programmable millivolt thermostat, it does not require batteries or a C-wire connection to function. It operates purely on the low-voltage millivolt signal provided by your heating system's pilot light or thermopile.
CT33A1009/E1 Video Guide
Watch this helpful video to learn more about the Honeywell Home CT33A1009 750 Millivolt Heat Only Non-Programmable Thermostat.
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