Central Heating Overide

[ollyparkhouse]

I have a strange question.
We have a Myson tank, radiators, a Potterton boiler and Honeywell timer.
Recently we had an issue with the central heating. An engineer came it to look at it and when he had finished he walked out and said he had overidden the system.

Now the Central heating is on permanently and it is baking hot.
The timer flicks to on and then off at the hours we specified, but it makes no difference.

How can we set the system back to the timer rather than on permanently?

Help,

thanks

 

[ollyparkhouse]

FYI its a honeywell st6400c and a potterton suprima 60l

 

[D_Hailsham]

The "engineer" could have just set the timer to permanently ON, or he has linked the timer connections together at the boiler.

What was your original problem?

Did the "engineer" explains what the cause was and why he set the heating to be on permanently?

 

[ollyparkhouse]

The original issue was a single radiator that didn't heat.
He changed the valve and the TRV, so I guess was testing it.

However since he walked out with no success the ch has permanently been on.

 

[D_Hailsham]

Open the flap covering the right side of the programmer.

Check that the heating (bottom horizontal slider) is not set to ON - it should be on AUTO.

Check that the vertical slider is on Run Programme.

If these are OK, I would phone the "engineer" - tonight - and ask him what he has done.

Do you mean that changing the valve did not solve the original problem?

 

[ollyparkhouse]

Turns out the motor on the main boiler upstairs had given up the ghost an was sticking in the on position.
So no matter what the timer said the motor was calling it to fire up.