Question about Honeywell Low Temperature Signal

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Winter boiler protection

We want information on how to set our honeywell thermostat for an absense from home for 5 weeks our boiler is an ideal make.we do have a manual but are finding it difficult to understand
j gill

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You can turn it down to 55 degrees so that it wil still come on but not freeze, be sure to open the cabinets underneith the sinks so that warm ait will migrate down there to help them from frezing.

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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Ideal response 120 seems to fire up but burner light does not come on and boiler runs for a while and stops,no hot water or heating ???


If this an older style boiler remove thermostatwires
at boiler terminal board and put jumper between R and W, if boiler starts you have bad thermostat.

If it does not come on then it appers that you have
a problem with the spark ignition or glow coil is
bad

Jan 09, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Temperature fluctuates


Actually that thermostat is adjustable for only +/- 1 degree. I would make sure it is located close to a radiator/register, whichever you have, to help close that 8 degree variance. The thing about hot water heat is that even when the boiler shuts down those radiators are still putting off heat, so the temp can still shoot up a few more degrees after the stat has been satisfied. Is the boiler shutting down when the stat hits 71* ? If not then the stat may be bad. Honeywell carries a 5 year replacement warranty on that stat. I use the Honeywell Focus stats in almost all my installations. They are a very dependable thermostat. Feel free to ask anything else that will help solve your problem...Rob

Dec 16, 2009 | Honeywell Focus 6300B 5-2 Days...

1 Answer

Ideal boiler no heat to radiators but hot water still working


check the divertor head and valve.
sounds like it ist adjusing from dhw to ch.
take head off(remove pi at back,or side pin) and push pin in valve when calling for ch,if it works then the head has gone.

Nov 19, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

I have just had a new boiler fitted and wanted to run the thermostat (honeywell cm921) on auto, the electrician set the timer to come on at 1 & off at 2 disabled at 3 & 4 and on again at 5 and off...


Complicated because I need more info....but in General a Boiler should not be on a Programmable Thermostat as it takes too long to heat etc...do you have Radiators in your house???Or ductwork for heat???It will make a difference...if you put the boiler on a program it may come on anyway as some boilers maintain there own internal temperature regardless of the thermostat.....if you want to run it on a program adjust the temperatures so there is only about a 2 degree swing....70...down to 68....back to 70.....etc...there should also be a switch in the thermostat to set for Boiler...or Electric heat...make sure that switch is on...otherwise its difficult to give you a more conclusive answer

Nov 11, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Require room thermostat for ferroli combi boiler optimax 25c . I have a honeywell at the moment which stopped working. it has two wires coming into it from the boiler


Get a Ferroli wireless programmable room stat. City plumbing supplies can get hold of them but you'd be looking at approx £130. Part number 30800009. No wiring involved, the receiver connects to the boiler pcb. Had same problem but now fine.

Feb 18, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Blank display on ideal isar 2 he 30


may just be a defective display PCB, byt more often than not, its the more expensive main primary PCB. Ideal actualy modified this PCB, and has a pre-fix of VF on it, and is orange in colour

Feb 18, 2009 | Honeywell Programmable Thermostat Heater

4 Answers

Honeywell - cm61ng- Keeps going on and off all night


Instructions on how to turn off your optimum start:-

Turn off ‘Optimum Start’
Step 1 Put the thermostat in the OFF position.

Step 2 Press 3 buttons together (at the same time) which are the INFORMATION BUTTON (i) and PROGRAM BUTTONS 3 & 4.
This will show a code of ICL 1 – now let go of the buttons.

Step 3 Press PROGRAM BUTTON 2.
This will now show a code of 30t 1

Step 4 Press the + BUTTON (on the left of the display), tap through until you reach 15 OP 1

Step 5 With the TEMPERATURE DOWN BUTTON; change the 01 to a FLASHING 0. Confirm the FLASHING 0 with the INFORMATION BUTTON ( i ). The 0 will now be static.

Step 6 Put the Thermostat back in the ‘AUTO’ position.
‘OPTIMUM START’ is now switched off.

Dec 31, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

HONEYWELL CM921 ROOM THERMOSTAT


Remember the is a time and temperature controller if you want to use as an ON/OFF controller please ensure you OFF times are set to LOW temperatures for example at 8:00am I want the boiler firing to 21°C at 10:00 I want the boiler to go OFF at 5°C so ensure all so called OFF times are set to LOW temperatures.

Oct 26, 2008 | Honeywell Programmable Thermostat Heater

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