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My central heating is set to max 20 degrees but we keep coming home to find house hotter than that. The thermostat is in the hallway, the boiler and froststat (latter newly replaced) are in the integral garage. The thermostat seems to shut the boiler off when 20 is reached but then it comes back on again. Potterton boiler 13 years old but has new mother board about five years ago.

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Hi Lyn,

Had the same problem with my system. turned out to be the thermostat in the hallway. Mine is an older electro-mechanical type with contacts that open and close as the temperature changes. (these type of thermostats click as you rotate the temperature dial) What had happened was the contacts had stuck closed even as the temperature rose and thus the boiler kept going. I cleaned the contacts with WD40 oil and everything is fine again. If you have the same type of thermostat this may be the problem. Be aware that if you or anyone else removes the cover of these thermostats there is live mains at the faulty contacts, be sure to switch off the circuit feeding this thermostat or remove/switch off the fuse in the main fuse box. Alternately you could replace the thermostat. If you have an electronic digital thermostat then this solution is not valid.

Good luck

Posted on Dec 24, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Honeywell 5+2 day programmable thermostat will keep heating to 29 degrees!

Our Honeywell thermostat is model RTH6300B. Now that the weather is getting hot, we decided to put the centeral air on. Hot air keeps blowing out. I called Honeywell several times thinking that we had fixed the problem. It still is blowing out hot air. Also, my husband checked the wires. Has anyone else had this problem? Any ideas what it could be?

Posted on May 29, 2008

boanhtgclg
  • 34 Answers

SOURCE: temp shows 2 degrees warmer than what is was set to

sometimes the furnace does a better job than anticipated, i wouldn't worry about it, especially if the furnace shuts off.
the setpoint is the temperature you want it to be
cycle lenghts are determined by how much recovery you are requesting. for instance, in the morning when you wake up, you want the temperature to be at its setpoint. what the thermostat will do is make the furnace run a limited lengths during the recovery process.

Posted on Nov 12, 2008

  • 2458 Answers

SOURCE: Gas heater shuts off & won't come back on

sounds like the thermostat replaceing it should help you could try cleaning the old one they can get dust it them

Posted on Feb 28, 2009

  • 308 Answers

SOURCE: thermostat problem ?

If you start by looking on your gas valve, you should find the correct amperage to set the heat anticipator at. I am not sure if you have a forced hot water system or a steam system, but depending on the case, you may also have a second problem, which is easily addressed. If you have forced hot water, the upstairs baseboard/radiators may be airbound and need to be bleed. If you have steam, you may need to slow down the downstairs valves, and open the upstairs valves to get a balance. Hope this helps

Posted on Jul 09, 2009

heatman101
  • 43501 Answers

SOURCE: Hi. We recently moved to a rented property. We

You definetly have a control issue. However trying to diagnose the exact problems that you have would be very difficult without actually seeing the wiring. You defintely have a wiring/control issue but I cannot tell you exactly what it is without more info. Sorry, I would love to help you more...

Posted on Nov 13, 2009

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amn_howac.jpg


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