worcester 28cdi rsf

[barkeep]

We've a Worcester 28cdi boiler which is 7rs old. It's been no bother at all
since its installation however it is now running intermittantly when in DHW
mode. All works ok upon demand for hot water, the boiler then runs for
approx 2 minutes before shutting down for 12/15 seconds, fires up and runs
for about 1 minute , shutdown sequence repeats.
If I turn the dhw temp control down, the boiler runs longer before cutting out....don't know if this helps the diagnosis
It runs continuously in CH mode.
Water pressure and volume are ok......could it be as simple as a blockage in the hot water filter.......any suggestions.

 

[scatmanjohn]

We've a Worcester 28cdi boiler which is 7rs old. It's been no bother at all
since its installation however it is now running intermittantly when in DHW
mode. All works ok upon demand for hot water, the boiler then runs for
approx 2 minutes before shutting down for 12/15 seconds, fires up and runs
for about 1 minute , shutdown sequence repeats.
If I turn the dhw temp control down, the boiler runs longer before cutting out....don't know if this helps the diagnosis
It runs continuously in CH mode.
Water pressure and volume are ok......could it be as simple as a blockage in the hot water filter.......any suggestions.

Sounds like your typical hot water heat exchanger fault.

Probably needs cleaning or replacing.

 

[Agile]

Most likely to be a blockage in the plate heat exchanger!

I presume you have never had a service during the seven years and the installer did not bother to properly clean the system before fitting the boiler. What does he say about the problem?

It does bode well for the reliability that it has been working for seven years without any problems though!

Tony