Hello all
We're having serious problems with our system (Potterton Kingfisher MF Y-plan system) and have called out two heating engineers with no resolution to the problem.
Sometimes when we program the system for hot water, after about 20 minutes, the pipework starts hammering and hot water gushes from the overflow pipe.
At least once when this happened, dirty water has dripped through the ceiling below where the header tank is situated. We have also noticed that the downstairs radiators (where boiler is; pump is upstairs) are so hot sometimes that we can't touch them and can smell paint.
At least once that I know of in the last month (when the problems started) the hammering has started when we were running the CH but *not* calling for H/W. The radiators were scalding hot at this time.
We called out HomeServe (via cover with our bank) and they said the pump needed to be set on high speed, which is all they did. A week later, the problem recurred.
We called a second engineer who said the boiler temperature control was faulty (it didn't seem to work when turned) and replaced this on Christmas Eve. We've since turned down the boiler temperature control but the downstairs radiators are still extremely hot.
We had no hammering since Christmas, until today. The C/H was on and we called for H/W. After about 20 minutes, the hammering started, I turned the entire system off and hot water gushed from the overflow.
Sometimes we run the hot water off but the cylinder doesn't seem to start refilling for several hours after this problem happens and the power shower sometimes actually runs dry (no hot or cold water). Eventually, it will start to refill and the header tank refilling is also clearly audible.
(Note: Just had a shower, 4 hours after I turned the system off. Water was hot and cylinder is now refilling. 22mm pipe out of top of cylinder is still hot to the touch at the cyl exit and still warm a couple of feet up the pipe to the loft).
Hot water runs clear and clean, not dirty in any way.
We had the 3-port valve and heating controls replaced a year ago (detailed on another thread) and were told at the time that the system was originally gravity-fed and has at some point been converted to y-plan.
The more problems we have and the more I read on the subject, the more convinced I get that British Gas (who installed the Potterton 6 years ago for a prior owner) botched the conversion and this is the root cause of the problems.
I'm loathed to keep paying out money for engineers who can't find the problem and wonder whether replacing the entire system with a condensing combi-boiler would be the best option.
Does anyone have any suggestions for what could be causing our problems? 3-way valve stuck in the A+B position?
Thanks in advance
Regards,
Neil
We're having serious problems with our system (Potterton Kingfisher MF Y-plan system) and have called out two heating engineers with no resolution to the problem.
Sometimes when we program the system for hot water, after about 20 minutes, the pipework starts hammering and hot water gushes from the overflow pipe.
At least once when this happened, dirty water has dripped through the ceiling below where the header tank is situated. We have also noticed that the downstairs radiators (where boiler is; pump is upstairs) are so hot sometimes that we can't touch them and can smell paint.
At least once that I know of in the last month (when the problems started) the hammering has started when we were running the CH but *not* calling for H/W. The radiators were scalding hot at this time.
We called out HomeServe (via cover with our bank) and they said the pump needed to be set on high speed, which is all they did. A week later, the problem recurred.
We called a second engineer who said the boiler temperature control was faulty (it didn't seem to work when turned) and replaced this on Christmas Eve. We've since turned down the boiler temperature control but the downstairs radiators are still extremely hot.
We had no hammering since Christmas, until today. The C/H was on and we called for H/W. After about 20 minutes, the hammering started, I turned the entire system off and hot water gushed from the overflow.
Sometimes we run the hot water off but the cylinder doesn't seem to start refilling for several hours after this problem happens and the power shower sometimes actually runs dry (no hot or cold water). Eventually, it will start to refill and the header tank refilling is also clearly audible.
(Note: Just had a shower, 4 hours after I turned the system off. Water was hot and cylinder is now refilling. 22mm pipe out of top of cylinder is still hot to the touch at the cyl exit and still warm a couple of feet up the pipe to the loft).
Hot water runs clear and clean, not dirty in any way.
We had the 3-port valve and heating controls replaced a year ago (detailed on another thread) and were told at the time that the system was originally gravity-fed and has at some point been converted to y-plan.
The more problems we have and the more I read on the subject, the more convinced I get that British Gas (who installed the Potterton 6 years ago for a prior owner) botched the conversion and this is the root cause of the problems.
I'm loathed to keep paying out money for engineers who can't find the problem and wonder whether replacing the entire system with a condensing combi-boiler would be the best option.
Does anyone have any suggestions for what could be causing our problems? 3-way valve stuck in the A+B position?
Thanks in advance
Regards,
Neil