Worcester 240 combi boiler? Can I repair siezed pump. Motor still trying to run. Click here for how to mend it. Which model room thermostat do I need? I have a Worcester Green Star 37cdi combi boiler. The room thermostat controller is showing an E1 fault so I need to replace it. Which model thermostat do I need? Click here for the repair. Who are Boiler Guide. The smarter way to find approved boiler engineers in your area. We match your requirements with pre-screened companies to ensure you’re only contacted by trusted & accredited professionals. My Bosch Worcester Greenstar 24 Ri Boiler was installed in about 2008. The pump keeps running for a very long time, even when there is no heat left in the radiators. There is also a lot of clicking coming from the boiler. Thousands of Worcester Bosch boilers repaired and serviced.
Worcester Bosch Cdi Boiler Pump Running Constantly Running
- This topic has 25 replies, 12 voices, and was last updated 8 years ago by .
- Central Heating – Over running pump – Advice needed
Morning All,
After a weekend of pretty heavy use our central heating system is showing its age a bit ðŸ™x81
Sunday night after the heating “clocked off” the pump continued to run despite the boiler being off. I decided that instead or arseing around Sunday night I would just shut down the system and the mains point.
Yesterday I had a period of chin scratching and then fired up the boiler again. exactly the same happened. Boiler cut out when prompted but pump continued to run 😕
I managed to get the pump to shut off by upping the thermostat on the boiler, starting up the system again for a moment then shutting it off. This then stopped the pump as it should.
Let the heating set as usual but at 10 last night the boiler “clocked off”but the pump continued to run 👿
I reset it using the method above.
This morning the heating came on and this time when the boiler “clocked off” the pump turned off too. 😡
I am guessing that something is up with the boiler stat 😕
Any thoughts?
The system is a std boiler, hot water tank. No room thermostat just the stat on the boiler.
Posted 8 years agoAre you sure this isn’t a design feature.
My boiler has a separate pump wired in parallel, so both are switched on/off at the same time by the timer / thermostat.
When it’s very cold and the boiler has been on for an hour or so it will get to the point where the returning water is hot enough to turn the boiler off but the rooms aren’t yet warm enough to trip the room thermostat, so the boiler stays off and the pump keeps circulating hot water to the rads. Eventually the rads dissipate enough heat and the boiler fires again. This cycle continues till the room thermostat shuts them both off.
Posted 8 years agosticky solenoid on pump maybe?
Posted 8 years agoDo you know if your pump is controlled by the boiler or wired in parallel to it?
If the rads are cold when the pump is over running then I suspect the pump is controlled by the boiler and something is bust.
If the rads are hot then its probably all ok.
Posted 8 years agoWhat he said ^
Posted 8 years ago
You need to dissipate the heat from the boiler itself as well – without an overrun water boils inside the boiler when the pump cuts out.pumps don’t have solenoids….
The solenoids switch circuits on and off. Pumps just pump water.
Posted 8 years agoTJ’s the man to speak to trained plumber and all
Posted 8 years agoSo it could just be the system dissipating excess heat?
Yup – some ‘low water content’ heat exchangers need the pump to keep running – it is controlled by either a ‘pump overun timer’ or a ‘pump overun thermostat’
the stat will keep it running to a certain temperature., the timer for a set period.
Not necessarily a fault. check the boiler instructions for any mention of pump overun.
Posted 8 years agoIf it is a pump overrun it should be a max of 15minutes. Leave it for half an hour and see what happens.
Also Combis operate the heating pump after hot water use to get rid of excess heat.
Posted 8 years agoWhat boiler? Apollo or suprima by any chance?
Posted 8 years agoI know nowt about it but is it the frost stat doing it’s thing?
Posted 8 years agoTry the hot water thermistor, unplug it and see if the overrun keeps going, for want of a better description ours went a bit earthy and caused the central heating to play up and work only intermittently. The PCB and both central heating thermistors were initially changed to no avail; it was only after the hot water thermistor was changed that the system started behaving itself again.
Strange thing was that it on curve for for resistance and temperature but plugging it back in caused the system to FUBAR.
Posted 8 years agoNah pumps always run over to cool the boiler down, same thing will happen after using the hot water. That is why you should always have a radiator in your house that does not have any TRV’s on it, so that there is always one one rad for the boiler to dump heat into. This is straight from the mouth of the best plumber in the world.
Posted 8 years agotoys, such generalizations are hardly ever true.
somw pumps are controlled from the boiler, usually via a temp sensor or timer. allow boiler to heat up, turn it off and see how long pump runs for, it should shut off, if it doesn’t then there is a fault somewhere.
Posted 8 years agotoys, such generalizations are hardly ever true.
OOops sorry Dad. It’s true I should have been more specific, if it’s a combi then the boiler ALWAYS over runs to dump heat unless the boiler has already cooled in use. If you want to diss my gas safe registered plumber (previously corgi for 15 years) who gave me this info then go for it, but what I say is correct. so blow me. 😆
Posted 8 years agoCalm down dear boy, I’m not dissing anyone.
Exactly you have assumed it is a combi and gas fired, it may be neither, which is where my generalization comment comes in.
Oh and I personally have been Corgi and Gas Safe for about the same length of time, also OFTEC for oil, should you wish to diss my comments!!!!!!
Posted 8 years agoExactly you have assumed it is a combi and gas fired, it may be neither, which is where my generalization comment comes in.
Oh and I personally have been Corgi and Gas Safe for about the same length of time, also OFTEC for oil, should you wish to diss my comments!!!!!!
S’alright I got your point, indeed I did assume it was a gas fired combi… Naughty boy, I’ll go and thrash myself.
Posted 8 years agoBetter! Apology accepted, but don’t be too hard on yourself!
Posted 8 years agoJust for devilment, not all combis have pump over-run 🙂
Posted 8 years ago
The topic ‘Central Heating – Over running pump – Advice needed’ is closed to new replies.
- This topic has 25 replies, 12 voices, and was last updated 8 years ago by .
- Central Heating – Over running pump – Advice needed
Morning All,
After a weekend of pretty heavy use our central heating system is showing its age a bit ðŸ™x81
Sunday night after the heating “clocked off” the pump continued to run despite the boiler being off. I decided that instead or arseing around Sunday night I would just shut down the system and the mains point.
Yesterday I had a period of chin scratching and then fired up the boiler again. exactly the same happened. Boiler cut out when prompted but pump continued to run 😕
I managed to get the pump to shut off by upping the thermostat on the boiler, starting up the system again for a moment then shutting it off. This then stopped the pump as it should.
Let the heating set as usual but at 10 last night the boiler “clocked off”but the pump continued to run 👿
I reset it using the method above.
This morning the heating came on and this time when the boiler “clocked off” the pump turned off too. 😡
I am guessing that something is up with the boiler stat 😕
Any thoughts?
The system is a std boiler, hot water tank. No room thermostat just the stat on the boiler.
Posted 8 years agoAre you sure this isn’t a design feature.
My boiler has a separate pump wired in parallel, so both are switched on/off at the same time by the timer / thermostat.
When it’s very cold and the boiler has been on for an hour or so it will get to the point where the returning water is hot enough to turn the boiler off but the rooms aren’t yet warm enough to trip the room thermostat, so the boiler stays off and the pump keeps circulating hot water to the rads. Eventually the rads dissipate enough heat and the boiler fires again. This cycle continues till the room thermostat shuts them both off.
Posted 8 years agosticky solenoid on pump maybe?
Posted 8 years agoDo you know if your pump is controlled by the boiler or wired in parallel to it?
If the rads are cold when the pump is over running then I suspect the pump is controlled by the boiler and something is bust.
If the rads are hot then its probably all ok.
Posted 8 years agoWhat he said ^
Posted 8 years ago
You need to dissipate the heat from the boiler itself as well – without an overrun water boils inside the boiler when the pump cuts out.pumps don’t have solenoids….
The solenoids switch circuits on and off. Pumps just pump water.
Posted 8 years agoTJ’s the man to speak to trained plumber and all
Posted 8 years agoSo it could just be the system dissipating excess heat?
Yup – some ‘low water content’ heat exchangers need the pump to keep running – it is controlled by either a ‘pump overun timer’ or a ‘pump overun thermostat’
the stat will keep it running to a certain temperature., the timer for a set period.
Not necessarily a fault. check the boiler instructions for any mention of pump overun.
Posted 8 years agoIf it is a pump overrun it should be a max of 15minutes. Leave it for half an hour and see what happens.
Also Combis operate the heating pump after hot water use to get rid of excess heat.
Posted 8 years agoWhat boiler? Apollo or suprima by any chance?
Posted 8 years agoI know nowt about it but is it the frost stat doing it’s thing?
Posted 8 years agoTry the hot water thermistor, unplug it and see if the overrun keeps going, for want of a better description ours went a bit earthy and caused the central heating to play up and work only intermittently. The PCB and both central heating thermistors were initially changed to no avail; it was only after the hot water thermistor was changed that the system started behaving itself again.
Strange thing was that it on curve for for resistance and temperature but plugging it back in caused the system to FUBAR.
Posted 8 years agoNah pumps always run over to cool the boiler down, same thing will happen after using the hot water. That is why you should always have a radiator in your house that does not have any TRV’s on it, so that there is always one one rad for the boiler to dump heat into. This is straight from the mouth of the best plumber in the world.
Posted 8 years agotoys, such generalizations are hardly ever true.
somw pumps are controlled from the boiler, usually via a temp sensor or timer. allow boiler to heat up, turn it off and see how long pump runs for, it should shut off, if it doesn’t then there is a fault somewhere.
Posted 8 years agotoys, such generalizations are hardly ever true.
OOops sorry Dad. It’s true I should have been more specific, if it’s a combi then the boiler ALWAYS over runs to dump heat unless the boiler has already cooled in use. If you want to diss my gas safe registered plumber (previously corgi for 15 years) who gave me this info then go for it, but what I say is correct. so blow me. 😆
Posted 8 years agoCalm down dear boy, I’m not dissing anyone.
Exactly you have assumed it is a combi and gas fired, it may be neither, which is where my generalization comment comes in.
Oh and I personally have been Corgi and Gas Safe for about the same length of time, also OFTEC for oil, should you wish to diss my comments!!!!!!
Posted 8 years agoExactly you have assumed it is a combi and gas fired, it may be neither, which is where my generalization comment comes in.
Oh and I personally have been Corgi and Gas Safe for about the same length of time, also OFTEC for oil, should you wish to diss my comments!!!!!!
S’alright I got your point, indeed I did assume it was a gas fired combi… Naughty boy, I’ll go and thrash myself.
Posted 8 years agoBetter! Apology accepted, but don’t be too hard on yourself!
Posted 8 years agoJust for devilment, not all combis have pump over-run 🙂
Posted 8 years ago
Worcester Bosch Boilers Uk
The topic ‘Central Heating – Over running pump – Advice needed’ is closed to new replies.