Question about Honeywell Programmable Thermostat Heater

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Hot Water is not comming

My System is not working properly, when I switch it on no hot water come but heating started even I don't switch on the heating, I tried it hard to switch off the heating, move the thermostat to zero but still the same problem i-e Heating remain ON and Hot Water is not coming.

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REPLACE THE CIRCULATOR PUMP ON THE SYSTEM.IT IS NOT PUMPING THE WATER.

Posted on Mar 07, 2009

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Thermostat is not switching on boiler.


There are many ways for a hot water boiler to be controlled. One of them is to have an 'on-board' aqua-stat that cycles the boiler burners to maintain water temp set-point and the space thermostat controls only the circulating pump. There is no way of knowing if yours is set up this way, but try turning the thermostat on and off and see if the circulating pump cycles with it.

Volumns can be written on boiler control but with the limited information provided we can only guess.

Aug 25, 2015 | Thermostats

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ST6400C programmer, heating switched off. Switch hot water on only, tank full of hot water but pump runs and radiators get hot. Wall stat is set at zero. When programmer is touched and the flap dropped to...


Have had a lot of these programmers with this fault.Integral fault with electronics.Programmer will need to be replace as unrepairable.You should be able to find a straight replacement version from your heating supplier.

May 11, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Hot water not going, wanting to know how to turn it back on?


You have a real good description of your thermostat--
I wonder why you suspect the thermostat to be causing your 'No Hot Water' problem?

First of all, I have to be sure I understand your real problem--
When you say you want to 'turn the Hot Water back on', (It is 'Not going')
Do you mean you want a boiler (maybe in the basement?) -- or maybe a zone valve in a Hot Water, Baseboard heating system-- to be heating your house/ room/ apartment?

I would suppose, if you have the thermostat set higher than the room temperature, that it should be giving a 'call' to the boiler (or Baseboard Hot Water Heater..) to ignite a fire, and heat the waer, and then heat your room, or house.

So-- Could the problem be in the Device heating the Hot Water?

Please tell us more about your heating system-- what type of fuel, -- What happens when you lower the Thermostat, and then raise it-- What used to happen, and what does NOT now happen, etc.

Tell us more clues-- maybe we can help remotely like this-

Mack B

Jan 26, 2011 | Emerson Fans 300 Heating & Cooling...

1 Answer

St6400c thermostat wont run the central heating independantly


This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.

Nov 05, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

One zone not working; another is partly working


i would check my water pressure on boiler sounds like lack of pressure or air in system they can be related. if you have bleeder on baseboard try to bleed.

Feb 20, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

No hot water honeywell st6400c


HW valve was stuck in the open posiion and the micro-switch was not working so thats why boiler and pump were not starting. Bled system to below the level of the valve to be changed, and replaced valve with a drayton ( easy quick change of valve head if needed no screws )

Sep 07, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell ST6400C programmer


Hi yes sound like it not working on hot water only it would check ou the wiring on this side

Jul 25, 2008 | Honeywell Programmable Thermostat Heater

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

2 Answers

No heat!


Ger, do you get your hot water off the same boiler and it that working alright? How many zones and are they controled by zone valves (little boxes mounted on the pipes) or circulators (small pumps)?

Boiling water sounds can indicate hard water deposits in the boiler or that your aquastat is set too high allowing the water to heat up higher than it should. Check your boiler guage and let me know what temperature you are recording. Get back to me with the answers to my questions, we'll figure it out.

Nov 27, 2007 | Honeywell Programmable Thermostat Heater

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