I've got a Turbomax plus 824E which is working well for me - but the timer on it is from the stone ages and there is no thermostat in the house. I'd like to fit a programmable thermostat in the hallway and use that to control the boiler (on/off times and temperatures).

I've taken the front of the boiler down but have found that the timer that's fitted is custom to the boiler, and fits using some "spikes" on the back of the timer that push though some grips on the control board.

Does anyone know if it's possible to fit an external timer or room thermostat to these boilers? I've looked through the manuals and the vaillant site and all I can find is how to pay £70 for a digital 7 day timer (with no advance or 1 hr boost function :( ).

TIA, James.

James, June 2007

you can fit a honeywell cm67 programmer, this is a fully programmable digital timer/roomstat, it connects via terminals 4 and 5 on the pcb, the unit itself is powered by two aa batteries, you can leave your existing timer in place and leave it on constant, the cm67 will override this. hope this helps

th stoke

tojo, July 2007

you need to remove the existing timer, it should just lever out as it is held in by 4 clips, one in each corner, then on the pcb near to where the mains is connected there will be a link between 2 of the terminals, this is where the thermostat will connect into.

gary.wright53@googlemail.com, June 2007