Honeywell DT90E Digital Room Thermostat

[alan83762]

About 4 months ago the room thermostat started to click ON and Off just like a 'Metronome', clicking approx once a second. After pressing all user controls, the only way I could get it to stop clicking was to remove a battery.

I checked the batteries, they were 1.5V each. I changed them for good measure. Again a month later the same happened again. Battery voltage ok. ( I tested them under load and they held 1.47V). I did think the supplied batteries with the stat might be elcheapos?).

Whilst the clicking was going on, I could hear the circulating pump going ON/OFF to suit. Pulling the 5amp plug on the pump did not cause the roomstat clicking.

For good measure I telephone Honeywell to enquire about the fault. Seems they have no records of other customers reporting similar problem.

The clicking started up after a few weeks again.

Anyway, I changed the DT90E for good measure for the same model again. Only to find the problem occured today after nearly 3+ weeks with the replacement.

Has anyone got any idea what the fault might be? I can't get the fault to show itself again but did video it performing it quirk.

Tomorrow I will put in some Duracells for good measure!

Thanks Alan

 

[Tibbot]

I've had ticking noises from 2 of the same, but just noise, no on-off. In the end I swapped for equivalent Drayton.

 

[alan83762]

Thanks, you are the first to admit to having come across the continual non stop clicking from the room stat.

 

[Tomo05]

Not sure if this should be on the same post so long after the original thread but I have just replaced my dial thermostat with this digital one and I am having exactly the same problem - ie the pump kicking in every 30 mins or so even though the control panel has the heating and hot water turned off. Is there a way to make the thermostat only responsive to the control panel timings?

 

[Steelmasons]

Try changing the parameters ie: cycle rate/min on-off times..

 

[Tomo05]

Thank you steelmason I will set the min on-off times to the same as my panel and see if that works.