Re the going upstairs: That was during the service yesterday - boiler in kitchen. He only went upstairs today. Also, I checked and there is no immersion heater in the cylinder - just a big brass blanking plug.
Heating question - major flood after service, what’s gone wrong here?
- Thread starter Mottie
- Start date
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Yep, I’ve already told my son to switch the boiler off.
If I'm reading the photos right - the 15mm pipe with the white paint is the cold feed. The pump is pumping downwards, which is passable but not ideal. The open vent is tee'd into the pump suction, nearly out of sight on the last photo.
Open vent and cold feed should be max 150mm apart, as headloss in the section of pipe between the two causes a tendency to overpump. Yours looks to be much more than 150mm, so no surprise it pumps over if the pump is on a high setting. Any partial blockage at that point makes it worse. My guess is the guy increasing the pump speed is what set it all off.
Open vent and cold feed should be max 150mm apart, as headloss in the section of pipe between the two causes a tendency to overpump. Yours looks to be much more than 150mm, so no surprise it pumps over if the pump is on a high setting. Any partial blockage at that point makes it worse. My guess is the guy increasing the pump speed is what set it all off.
Me too
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But he didn’t increase it when he did the service, only the temperature on the boiler.
So is the bloke who serviced it and is now trying to fix it!
OK, but in posts #11 and #14 increased pump speed was suggested, and you didn't deny it!
Apologies. And thanks to all that have given advice. I’ll let you know how it pans out.
Service on that boiler cannot cause a leak
If in doubt, look at the manual. The service entails checking condensate trap, manifold pressure and carrying out flue gas analysis- often even these basic tests are not carried out. In many cases FG analysis is compared to coarser catch all ratio of 0.004 instead of what is stipulated for a particular boiler
Service would cause the pump over to take place. Running the boiler at Max would not cause water in the header cistern to be hot, be it for heating or hot water demand. If pump was set correctly, system delta the would be appropriate for the boiler. I would want to check the Benchmark logbook-often left blank or figures pulled out of air.
Pump over is taking place going by what the poster has said. Present engineer most likely altered the pipes to eliminate pump over.
Often 28mm pipes used to gravity heat hot water cylinder. When boiler changed by boiler nailer to the wall fitting a heat only boiler is akin to rocket science to combi slingers, pumpover results if pipes not adjusted.
Unless further info comes to light, I suspect the present guy is in the clear. Power flush etc is a ploy that might have been used unless the feed and expansion is blocked up which again points slack commissioning and installation care.
If in doubt, look at the manual. The service entails checking condensate trap, manifold pressure and carrying out flue gas analysis- often even these basic tests are not carried out. In many cases FG analysis is compared to coarser catch all ratio of 0.004 instead of what is stipulated for a particular boiler
Service would cause the pump over to take place. Running the boiler at Max would not cause water in the header cistern to be hot, be it for heating or hot water demand. If pump was set correctly, system delta the would be appropriate for the boiler. I would want to check the Benchmark logbook-often left blank or figures pulled out of air.
Pump over is taking place going by what the poster has said. Present engineer most likely altered the pipes to eliminate pump over.
Often 28mm pipes used to gravity heat hot water cylinder. When boiler changed by boiler nailer to the wall fitting a heat only boiler is akin to rocket science to combi slingers, pumpover results if pipes not adjusted.
Unless further info comes to light, I suspect the present guy is in the clear. Power flush etc is a ploy that might have been used unless the feed and expansion is blocked up which again points slack commissioning and installation care.
That should not cause system to leak. On some boilers the appliance needs running at Max in order to correctly analyse flue gases whereas on that model a control is adjusted on the pcb to cater for flue gas analysis. It might be possible the chap just ran the boiler at Max, almost the same thing, in order to glean what the flue gas analysis was. Aforementioned is conjecture on my part as to what the service guy did.
Is there an overflow connected to this system and did it not show any discharge?
If f&e didn't split how did water spill out?
If f&e didn't split how did water spill out?
Sorted apparently. It was turned up too high. Just had this from my son.
Any self respecting tradesman who takes pride in his work will be worried when something goes belly up. But based on what OP wrote, I cannot see any reason why a service on that boiler would result in flood.
Not a chance in million years if that boiler was fitted correctly that running that boiler at Max would result in flood. In deepest winter boiler MAY NEED TO RUN AT MAX SETTING to get the radiators to heat the room to designed temperature. So you are saying your son will be happy to be freezing with that boiler chugging along at medium setting when inside of windows are iced up?
You seem to have latched on to boiler setting which is irrelevant.
Not a chance in million years if that boiler was fitted correctly that running that boiler at Max would result in flood. In deepest winter boiler MAY NEED TO RUN AT MAX SETTING to get the radiators to heat the room to designed temperature. So you are saying your son will be happy to be freezing with that boiler chugging along at medium setting when inside of windows are iced up?
You seem to have latched on to boiler setting which is irrelevant.
I'm still going for a partial blockage on the return pipe to the boiler.
Andy
Andy
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