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Honeywell wall thermostat

Hi,
My central heating isn't working at the moment. It turns on and off erratically. It doesn't seem to be the timer and the cylinder thermostat seems fine so I believe it is the wall thermostat which is an old Honeywell model that is no longer on their website.
At the moment a metal wire is in a terminal that has the earth symbol on it, a blue wire is in 2, red is in 3 and yellow is in . Please could you tell me if this is correct?
Thanks!
Richard

Posted by on

  • Richmart Sep 09, 2008

    Many thanks.

    I'll look into this- definitely sounds a posibility.

    Richard.

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  • 171 Answers

Hi,Richmart
I'm Harvey the Plumber,
First, Your question is if your thermostat is wired correctly!

Assuming that it is correct, a common problem that most people and plumbers overlook is correctly setting the heat anticipater on the thermostat.
Assuming that you have a gas central heating system, then you must simply look on the gas valve for the amp rating.
For instance,if the gas valve printing says .4 amps then set the heat anticipater for .4
It's common for the unit to turn on and off erratically (short cycling) when this setting is not correct.
If all you are worryied about is the wiring, you must look at the wireing diagram that came with the thermostat.
Further diagnoses would requie detailed information about your central heating system.
Or the alternative would be to have a hands on tech help you out.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey

Posted on Sep 09, 2008

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Posted on Jan 02, 2017

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