Hope someone can help. We have an "Ideal Minimiser SE" Boiler and a Megaflow Unvented system. This has been working fantastic for 8yrs and the boiler serviced twice in this time, (last time engineer said everything was fine and did not need doing!). At the begining of December the boiler tripped on the overtemp stat. (Engineer said that it was the pump and replaced it with a "Grundfoss Selectric"), One week after this, the central heating kicked in with a terrific clatter, I switched off and found the pressure had dropped to zero.
Engineer(s) (3 in total) have all said "it's a leak mate", but we cannot find any sign anywhere, have even had boards up etc. Also there is no water discharge from the PRV's etc. I have had a bag tied on exhaust outside, no water discharged. I have bleed all rads and the pump, cannot find any air in the system... One thing is that the pressure holds if we do not use the heating, i.e no boiler or pump on. Could the pressure loss be within the boiler, heat exchanger etc, if so how could I check, or does anyone else have an idea. The local engineers are costing a fortune in tea and coffee and only telling me what i already know... Ps There is no visible water within the boiler or on the floor around the boiler... Thanks
Engineer(s) (3 in total) have all said "it's a leak mate", but we cannot find any sign anywhere, have even had boards up etc. Also there is no water discharge from the PRV's etc. I have had a bag tied on exhaust outside, no water discharged. I have bleed all rads and the pump, cannot find any air in the system... One thing is that the pressure holds if we do not use the heating, i.e no boiler or pump on. Could the pressure loss be within the boiler, heat exchanger etc, if so how could I check, or does anyone else have an idea. The local engineers are costing a fortune in tea and coffee and only telling me what i already know... Ps There is no visible water within the boiler or on the floor around the boiler... Thanks