air trapped in coil

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diamondgas said:
I've had a cupl of customers order the pcb's online for various faults .. one being a pump overrun issue. It saves waiting in for the delvvery and any potential warranty problems being pointed your way..... And NO, custard orders and you fit 🙂

Regards the fault. If I suspected the overrun I'd want to be checking the system from cold! Put into water only and fire up. Hands on flow and return to check how well the system was circulating. If no serious temp diff then I'd continue to run on hot water only to get the boiler up to max temp ASAP. If overrun issue is what you're testing for then you need to be either checking the pump or have your multimeter on the pump live&Neutral at the terminal strip on the boiler. there needs to be a constant 230v. If the noise starts in conjunction with the power dropping out then you know the overrun relay on the pcb is gooshed!!! Thing is with intermittent faults it's not guaranteed to happen all the time!!!

Check it from cold mutley racers ... f&r temp diff on h/w only will tell you how well the boiler is circulating from start-up till fail...!
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Awesome. Thanks. Will give this a go. Exciting
 
Went back this morn and checked what you guys were on about with pump overrun. When in pump over run l, after around 3minutes pump cuts out and instantly re-starts again. Boiler does not fire up with that. Does it about 2 times and then fires up. So it gets 240v and then stops, intermittently. But it makes gushing noise all the time. So dancin, does hat seem like the fault you described? Not just when pump starts and stops. Also got me kane temp clamps on coil flow & return and they have a 9 degree difference.

Tried draining and back filling through drain COCK but doesn't seemed to have worked

Tried draining down
 
why did it not work back filling it ? did you run water till air comes out of the cold feed or expansion pipe ?
 
is the combined feed and vent an addition ? it could be as diamond said it could be the old cold feed and vent tee under the floor partialy blocked
 
To rule out overrun you could try temp linking the pump live to the permanent live see if the noise still re-occurs? A 9DegC diff is good circulation in my mind mutler racers 🙂 A combined feed and vent will stop and air ingress via the vent so you can rule that out. I'm still inclinded to think it's boiler/heat related. Not being there, of course, I'm not seeing, hearing or feeling what you're experiencing 🙂
 
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diamondgas said:
To rule out overrun you could try temp linking the pump live to the permanent live see if the noise still re-occurs? A 9DegC diff is good circulation in my mind mutler racers 🙂 A combined feed and vent will stop and air ingress via the vent so you can rule that out. I'm still inclinded to think it's boiler/heat related. Not being there, of course, I'm not seeing, hearing or feeling what you're experiencing 🙂
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Thanks diamond. The mind boggles
 
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mutley racers said:
Thanks diamond. The mind boggles
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Don't know if "the mind boggles" on what I posted.... Bit more clarity maybe? If you link the pump to the permanent live it'll rule out the overrun and any integral switching, as you're giving the pump a continuous supply rather than one governed via the PCB's 'switchover' relay effect from switched live to permanent live! If the noise and/or 'swishing' at the pump stops then you know it's the 'lag' caused by an indecisive PCB.......? 🙂
 
Sorry, I just meant my mind boggles at fault. Will try as you have suggested. I love learning all these tricks. It gets really fun
 
mutley racers said:
Sorry, I just meant my mind boggles at fault. Will try as you have suggested. I love learning all these tricks. It gets really fun
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That's the beauty of this place, potentially mutley racers ... to learn the 'tricks' 🙂 Not saying that I'm right in my assumptions to be honest ... I want to help you get to the bottom of the problem you have and am happy to assist where I can on limited info... 3D is always best but this place offers an alternative 🙂
 
Let's know the results of the problem mate! Or lake it further into discussion yeh!
 
Sounds like air to me and the coil is running less than half (if that) full. Probably caused by the coil rising slightly inside the cylinder.
If you feel brave disconnect the flow from the coil and stick a bit 22mm inside until it hits the bend then pull upwards. This will bend the coil down a bit inside. Then fit an auto air vent to it.
 
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