Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

1 Answer

Home heating and thermostat

Home heating system
honeywell t8635l thermostat- have three zones in house.

Two zones are working but the main zone will not come on to heat.
It has all the appropriate lights and numbers on the thermostat when I enter information but no response from heater.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 30 Answers

It is possible the relay on the zone board is bad, You can test the thermostat if you own a voltage meter. It is possible for the thermostat to display and still be bad.

Posted on Mar 20, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Recently purchased and moved into older home with a hydronic radiant heat system with boiler. Upon running the system in the colder temps, we are hearing a gurgling sound recurring in some of the runs


typically hydronic systems like that need to be bled, start with the highest radiator, the bleed valve have a little square head and you need to have a key that fits them, most supply HVAC houses have them sitting on the counter but you can ask them for one.

Jan 14, 2015 | Heating & Cooling

1 Answer

Just moved in to new house with central air. Despite turning all 3 zone thermostats to off (ie no cool, no heat), there is still air being blown through vents throughout the house. (fan switches are also...


You should not have the blower fan running if all thermostats are set as you say. You either have a relay problem in the air handler or the zone system wiring or controller is defective.

Sep 01, 2011 | Honeywell Heating & Cooling

1 Answer

The Zone 1 (basement) and Zone 3 (second floor; no


On the zone damper motor, there should be a little lever allowing you to open the damper for emergency heat. Probably a bad zone motor or connection.

Dec 26, 2009 | Honeywell Electronic Programmable...

1 Answer

Valve replaced , but 1 zone out of 3 no heat when


Hello. Each zone in you home has one thermostat controlling one zone valve. Generally, when a thermostat is calling for heat the zone valve opens and the circulating pump comes on to move the water around that loop. If your other two zones are both working as they should and you now have a new zone valve on the third loop I would suspect that the thermostat is faulty. Regards, Joe

Dec 12, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Just bought a home with a Honewell trol atemp universal mini zone


because it dosent have a duct sensor - should not be a problem

Sep 03, 2009 | Honeywell Electronic Programmable...

1 Answer

2 zone sytem main floor cooler than what i set it to


Warm air rises and if the upstairs thermostat is on it will onerride to lower the temp upstairs. To have the dowstairs thermostat govern, the up stairs must be off . The whole house will balance to the controlling thermostat.

Jun 02, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell T87f 3855 Doesn't Activate Heater


thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Jan 25, 2009 | Heating & Cooling

1 Answer

Honeywell ST6400C programmer doesn't switch off


Since you have three on/off timing modes could there be an overlap in the times?
The wires in the unit might be crossed. (don't always assume the contractor who wired maintained the correct colors , I have a friend who blew out a heating pipe because when a replacement motor valve was installed it was never wired right and the plumber assumed the colors were correct so no overtemp shutoff created steam in PVC pipes, OPPS)
There fore maybe one is still coming on. Do you have more than one heating zone? IF so see below

I guess the main question is why manually turn it off? why not use the program.

I will assume your heat is know as forced hot water heating. My house is multizoned however when the zone calling for heat turns off (zone valve closes) I installed a bypass valve in the lowest zone in the house, and reduced the circulator low shut off temp to 130 F which means even though the heat isn't on my circulator will continue to run dumping this excess heat in the lowest part of house to rise through house. (the spring loaded water valve allows the heated water to flow into this zone )We do have two thermistats. And even though the lowest one is not calling for heat the radiators are hot when the excess is dumped into this zone. So investigate and see if your system might be similar. (multizone).

Investigate your wiring, reprogram, replace any battery backup.

Dec 18, 2007 | Honeywell Programmable Thermostat Heater

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

191 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

paulcarew

Level 3 Expert

2179 Answers

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...