I have checked Projects and other posts but would like some guidance!
I have a 10-15 year old house with double glazing so should be reasonably insulated with a conventional gas boiler and radiators. Upstairs is fine (bordering on hot!) but downstairs is cold. Radiators get warm but never "to hot to touch unlike upstairs. In fact when its cold the downstairs never gets warm enough to turn of the rom sta (it clicks at about 18). I have had system power flushed last year, i have balanced system (upstairs all have return valve almost closed) upstairs is better but downstairs still cold. I am concerned could be boiler or pump and plumbers dont seem to want to help diagnose only do jobs you tell them so a couple of questions:
1. The boiler sems to come on and go off quite regularly, if stat not turning boiler off should it not just stay on? Is this oeprating correct.
2. We have 13 rads and I wonder if pump not working but if I check the pump it is spinning. Would a better/newer pump help?
Very kind of you to reply.
Unfortunately the house is on micro bore pipes, other than two new rads fitted upstairs after extension. Which are on "normal pipes"
I have the pump always on top speed, ( I have bled the pump and also checked its spinning freely which it is).
The boiler is always on its top setting but seems to come on/off quite intermittently even if the room stat and hot water tank stat are on. I have a thermometer which measurers the water output at about 49degrees. is this right???
The rads downstairs do get warmer at top compared to bottom, and I have checked
Well, found out now that my boiler Ideal Classic NF40 is only providing water at 50degrees even on the higest temperature setting. (I know this as I bought a thermometer to check!!) Spoke to Ideal but they are know help just say "get someone in". Can any of you plumbers or heating engineers give a suggestion as to whats likely to make the water only heat to 50degrees, I guess a thermostat or similar but then Im know plumber!!
Hi Darren, sounds like either boiler stat is faulty or gas burner pressure is low. Unlikely to be sludge if you have already had it flushed. Sometimes pumps can still run but not turn the impeller. Burner injector may also be partially blocked. A service will show up any boiler faults. Don't try adjusting gas pressures yourself. Hope this helps.
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