Plumbing Questions? Ask a Plumber for Answers ASAP
Good afternoon, welcome to the Technical section in JustAnswer; my name is ***** ***** I will help you today.Your problem initially sounds like poor (or no) circulation. What is the make and complete model number of the boiler?_____If you receive a phone call offer, please ignore it - these are system generated and outside my control. My understanding is that you won't be charged if there's no phone call.
OK. This is a system boiler, so any boiler fault would affect both hot water and central heating equally. Do you get any of the banging symptoms when heating the hot water?If not, please tell me what MZVs (motorised zone valves) you have in the system. These can have silver metal box attached to a black cable, or a white plastic box, or sometimes a blue plastic box.
Please could you read my questions again?
OK. My hunch is that the system pressure is too low. Could you tell me the reading on the pressure gauge when the boiler is cold?
OK. This boiler doesn't have a differential water pressure sensor, so the next most likely possibility is a failed circulating pump.Have you had any occasions recently where the radiators don't get very warm, or the hot water takes a long time to heat up?
And were the upstairs radiators tending to get hotter than the downstairs ones, or were they performing the same?
My money is on a failed/failing pump. Is the diagnosis and fix something you're thinking of going yourself?
You will need a Gas Safe registered engineer, not a plumber, because the pump is inside the boiler casing. Do you have the details of the engineer who last serviced the boiler?
Sorry that there's no quick fix for this. I hope that your engineer can come soon.
You're welcome :-)
Thank you for your rating, and the kind bonus :-)I just saw that I missed your question, sorry...The engineer will need to arrive at their own diagnosis of the problem and then give you a price for fixing it. Even though I think it's the pump I can't tell you the cost of the part without looking it up, and the job might involve other materials, for example corrosion inhibitor, so it's impossible to give a price without visiting.