Honeywell digital eco room stat

[Dic Penderyn]

Evening all!

Replaced existing thermostat today for one of those Eco stat which I have attached a spec: View attachment honeywell stat.pdf

It is a combi gas heating system (Worscher Bosh) and before I connected new eco thermostat the temperature on combi was working fine at a steady 24C. After replacing old for new the temperature on combi started to rise then fall and then would flash. Tried wiring in lots of different possible combination tested fuses etc... but nothing.

Where did it all gone wrong? :sad3: Any suggestion much appreciated!

 

[ianbrookes]

how did you wire the DT90? are the batteries good ?

 

[drew35]

I would guess its a settings issue with the stat itself.

Do you have all of the parameters set for the particular application? To start with six cycles per hour and minimum on/off time one minute?