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Hello Everyone!
I have what appears to be two (possibly linked) problems which I would appreciate advice on if anyone could help. I have a Ravenheat Little Star Gas Combi Boiler, approx 4 yrs old, running 12 radiators. Pump speed currently on setting 3 (max).
Problem 1 - Hot Water keeps cycling hot/cold if the temperature dial is turned anything past the 1pm position due to boiler burner cut-out and restart. I have read a couple of posts already on this and it sounded like a thermistor problem. I replaced the correct thermistor and it hasn't made any difference. The manual and other posts points to potentiometer; however I am slightly reluctant to go purchasing more parts if this isn't to be the likely cause. Any ideas?
Problem 2 - Noisy radiators. None of my rads have TRVs and are all correctly balanced to give good output. Aside from the usual odd bang when they come on and expand/contract, there is an intermittent pipe tapping noise when the heating is on from the odd radiator. This can actually be felt by hand on top of the flow pipe offending valves as a pushing movement. All radiators have been bled time and again. The noise wakes the house up which means many cold mornings! I have also checked the pipes for rubbing; no obvious signs as I don't have the place fully carpeted.
The link between the above problems came to me when playing with the pump speed setting. I noticed if I turn it down to setting 2 (medium) the noise in the radiators reduces considerably , and they remain just as hot. However; upon doing this the hot water side of things then cuts out much, much sooner which results in the intermittent hot/cold cycling happening more frequently . The cycling starts to kick in after about 30-60 secs, the boiler shuts down, restarts and then does the whole thing again. I then tried pump speed 1 (low) out of curiosity and the hot water then cuts out after about 10-15 seconds!
There is some issue here between the two. I think water is cycling around the radiators far too fast due to the pump speed being too high (on setting 3); hence the noise and vibrations. However addressing this makes the water cut out problem a lot more prevalent.
Apologies for the long post, but I needed to fully explain the current situation as far as I'd taken it. Any help is really appreciated on this as it's driving me and my partner mad!
Jamie
I have what appears to be two (possibly linked) problems which I would appreciate advice on if anyone could help. I have a Ravenheat Little Star Gas Combi Boiler, approx 4 yrs old, running 12 radiators. Pump speed currently on setting 3 (max).
Problem 1 - Hot Water keeps cycling hot/cold if the temperature dial is turned anything past the 1pm position due to boiler burner cut-out and restart. I have read a couple of posts already on this and it sounded like a thermistor problem. I replaced the correct thermistor and it hasn't made any difference. The manual and other posts points to potentiometer; however I am slightly reluctant to go purchasing more parts if this isn't to be the likely cause. Any ideas?
Problem 2 - Noisy radiators. None of my rads have TRVs and are all correctly balanced to give good output. Aside from the usual odd bang when they come on and expand/contract, there is an intermittent pipe tapping noise when the heating is on from the odd radiator. This can actually be felt by hand on top of the flow pipe offending valves as a pushing movement. All radiators have been bled time and again. The noise wakes the house up which means many cold mornings! I have also checked the pipes for rubbing; no obvious signs as I don't have the place fully carpeted.
The link between the above problems came to me when playing with the pump speed setting. I noticed if I turn it down to setting 2 (medium) the noise in the radiators reduces considerably , and they remain just as hot. However; upon doing this the hot water side of things then cuts out much, much sooner which results in the intermittent hot/cold cycling happening more frequently . The cycling starts to kick in after about 30-60 secs, the boiler shuts down, restarts and then does the whole thing again. I then tried pump speed 1 (low) out of curiosity and the hot water then cuts out after about 10-15 seconds!
There is some issue here between the two. I think water is cycling around the radiators far too fast due to the pump speed being too high (on setting 3); hence the noise and vibrations. However addressing this makes the water cut out problem a lot more prevalent.
Apologies for the long post, but I needed to fully explain the current situation as far as I'd taken it. Any help is really appreciated on this as it's driving me and my partner mad!
Jamie