Honeywell CM707 Thermostat

dranzer01

Has anyone experienced....:

I press 'auto' on my thermostat, then the flame shows and the heating kicks in...
about 5 minutes after you hear a 'click' and the flame disappears and the heating turns off...
said procedure happens a number of times...
how do i make the heating just stay on?

oldagetraveller1

Someone more knowledgeable will hopefully reply. Is there a manual option and does the boiler stay on with that? Is the thermostat temperature set high enough?

Alternatively could it be a boiler fault? However, depending on boiler, a fault would be indicated somewhere.

Tallerdave

If the flame symbol is going off then the thermostat thinks the target temperature has been achieved.  What temperature is set and what temperature is it reading? 

macman

Press the 'up' button to raise the temp by 1/2C. What happens then?

red_flump

It sounds like it is working normally.  When some Honeywell thermostats get close to the setpoint, they cycle the boiler on and off. This prevents overshoot, wasting money on going over the set temperature. Works very well.  

Eccles04

This may also happen if the pressure in the system is too low. Happened to me quite often in my last house and I had to open the water inlet tap on the boiler to get the pressure back up to where the boiler was happy.