Question about Honeywell Programmable Thermostat Heater

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Festa 1.1 heater not working replasted the control valve under the bonnet still not working seems to be not bad water pressur thank you

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Replast water pump working well now thanks

Posted on Jan 05, 2009

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Came home after a weekend away and central heating not working. Programmer not turning heating on (honeywell st6400c) but the boiler (a sentima ht 60l) looks like it has a fault. The mains light us on but...


Possible cause of lockout: boiler low water level. If you have a combination temperature/pressure gauge, it should read approximately 12 psi when the boiler is cold. When it runs, it will be approximately 22 psi. If the pressure is low feel the inlet water supply piping. Open the manual feeder valve. The cold water coming in will verify that there is no obstruction to the water flow. You may have "dirt" in the line. You may have a defective water pressure valve or check valve. Another thought. Make sure your AIR SEPARATOR is functional. Remove the cap and depress the valve. You should see water. If air comes out, continue to"bleed" the AIR SEPARATOR. You may haven't to replace the A/S.

Jan 28, 2013 | Heating & Cooling

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Heating not working and Honeywell Thermostat Heater states that the temperature is 45 degrees celsius.


without seeing it its hard to say, the thermostat controls the boiler and/or diverter valve depending how its been wired, the diverter valve shunts the water to were its needed ie from one circuit to another if you have two therostats there is a conflict somewere, best bet to have an engineer sort the wireing out

Dec 28, 2011 | Honeywell Programmable Thermostat Heater

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Furnace cuts off before reaching set temp.


You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

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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

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

Have hot water but no radiators. Checked pilot


sounds like your circulating pump is bad or electronic zone valves

Oct 26, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I have just installed underfloor heating with 4 zones. I also have the existing radiator system. The radiator system is currently programmed to come on and off twice a day but has no room thermostat. We...


You say you have3 rooms on the underfloor system that will probably require different temps. You said you have 1 zone valve for the under floor system. You can not control all the rooms with different thermostats and only 1 zone valve. You need more information and professional help here. I can give you more advice too...

Jun 22, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell ST6400C - hot water not working


some digital thermostats do no not work with zone valves is this a new thermostat that you had installed

May 08, 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

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