Honeywell thermostat T6360 - Set temp/click question

[Combi672]

Hi there,

I have an old Honeywell thermostat T6360 that has worked for many years and still to this very day.
My question is regarding the temperature that is set in which it "clicks" and the heating kicks in, through the radiators and such.

Pretty much it's always clicked at 20 for 15+ years. However, when a family member turned the dial down recently and it was briefly turned back up again, it has now randomly started to only click at 23.

Is there any way to adjust this back to 20 on the dial at all?

Thank you.

Kind Regards

 

[DP]

If there is a heat source like your hand atop the thermostat, it will click at a higher temperature

If you suspect it is defective, instal an programmable thermostat for dinner and better control of heating.

An example. https://www.mrcentralheating.co.uk/honeywell-home-t4-7-day-programmable-room-thermostat

 

[gas112]

yeah pull the knob off the spleen and move it

 

[stem]

As a rule of thumb, the thermostat should 'click' at the ambient room temperature. So, if it's 21C where the thermostat is located, it should click off at 21C. If it's 18C where the thermostat is located it should click off at 18C. But it's not that definite.

These old design thermostats are mechanical in operation and not as accurate as the modern electronic devices. To improve their accuracy, Honeywell fit a small heater inside the thermostat called an 'anticipator'.

When the central heating is switched 'on' by the thermostat, the anticipator heater is also switched 'on' and the tiny amount of heat it produces encourages the thermostat to switch 'off' a tad earlier than it would. Then as the 'anticipator' cools it encourages the thermostat to turn the heating back 'on' a tad earlier. The net result is that the thermostat accuracy improves. For example; having a one degree differential between switching 'on' and 'off' as apposed to a two degree differential if the heater wasn't operating.

Some poor installations often don't have a neutral connection to terminal 2. And whilst the thermostat will still operate the heating, the 'anticipator' won't work and the improvement in accuracy is lost.

When testing the thermostat it's important that the operation of the 'anticipator' is taken into account. The anticipator won't work if the programmer or timeswitch is not providing power to the thermostat. Or, insufficient time is allowed between on and off cycles for the 'anticipator' to work. It can really only be done properly when the heating is actually operating under normal conditions. The best way to test is during cold weather. Leave the heating operating with the thermostat at a reasonable room temperature, which for most homes that's usually somewhere between 18 to 21C. Place an accurate thermometer on the Honeywell and leave it there until the thermostat clicks off. The reading on the thermometer should then match the setting on the Honeywell.