Diverter Valves on combi boilers

[Chriscaa]

Just had a new combi boiler fitted because the diverter valve kept sticking on the old one. Had new boiler two weeks and the same problem has occurred ie. central heating won't turn off. Does anybody know why these valves jam - the system has had a power flush - anybody got any ideas why I have the same problem on two different boilers?

 

[kevplumb]

what boilers

 

[Chriscaa]

Sorry for delay in replying - sorting out repair engineers. My new boiler is a Worcester Bosch Greenstar Highflow 550i. When running hot water heating is on also then doesn't turn off when you turn off water. Hot water is not as hot as it should be.

 

[twgas]

I think you need to get back on to your installer, I've never had a new boiler with a problem like this, if you've got the same prob as before would suspect the wiring/installation rather than the boiler itself.

 

[scatmanjohn]

I think you need to get back on to your installer, I've never had a new boiler with a problem like this, if you've got the same prob as before would suspect the wiring/installation rather than the boiler itself.

But its a combi. How would that work?

 

[bodo]

When a problem like this surfaces so soon after installation and mirrors previuos boiler issue faults invariably turn up in the control thermostats/wiring outside of the boiler.
Did you solve the problem?

 

[Agile]

Unfortunately for your first post you have chosen to add to an old posting.

Nor do I agree with what you have said. Perhaps you are not familiar with the 550 ?

It is quite possible to install and use this boiler without any wiring outside the boiler. At most all it would have would be a programmable thermostat or similar controller.

I have not heard of any sticking diverter valves on the 550.

Previous 400s or earlier models did often get sticking diverter valves but these were mostly as a result of dirt in the water.

When an owner says the system has been power flushed then sometimes it has not and other times no or wrong chemicals have been used. So there can still be dirt in the system.

Tony

 

[bodo]

Hi Tony
Wonderered what I previously posted that you did not agree with?
I do not recall suggesting that a boiler could not be installed without external controls.and nor did I suggest that the problem was a sticking diverter valve Incidently If a member suggests that they have specifically 'power flushed' rather than simply flushed sureley you have to iniatially assume that the member has actually flushed the system .If you continue to assume that what a member tells you is not the case what can you really base your advice upon?
matt

 

[Agile]

The OP implied that the new boiler was fitted by a professional installer.

Many times, particularly where faults have occured, it turns out that the water treatment which the owner thought had been done had not.

To most owners flushing and power flushing are the same thing.

Tony