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Many Thanks.

Hi Leytonjc, Thanks for your advice. Advanced information is always better than going in blind. If the arm does not reach the microswitch, what else can be done to fix the problem.

For those who answered my query I am sorry to say I have wasted your time. I was given incorrect information. The Zone Valve is infact a "Honeywell 4043H" but the problem is as stated.

Not sure, I have only ever removed the cover and changed the Servo Motor on the CH Valve. Not sure if anything else could be removed, I will check tomorrow.

Many thanks, I will check it out. Is the micro switch a changeable part?

Many thanks but I am already doing this so that I can at least get hot water when CH is called for. Trouble is the house soon gets up to temperature during this mild weather in the south.

I have a Potterton FF80 Fanned Balance Flue Gas Fired Boiler, about 10 years old. Although the boiler will fire up when Central Heating is called for, it will not fire up when Hot Water is called for. The Drayton ZA5/679-2 (22mm) two port Zone Valve opens but the bolier will not fire up. The...

I have fitted a new motor. Everything is now fine. Thanks for advice given

It is a two port Honeywell V4043H Motorised Zone Valve. 240volt. I aim to replace the motor

Many thanks, I will give it a try

I have a Potterton FF80 Fanned Balance Flue Gas Fired Boiler, about 10 years old. Although the boiler will fire up when hot water is called for, it will not fire up when Central heating is called for. I have changed the Electronic Controller, checked the Thermostat and tried a new programmer...