This has probably been covered a million times on this forum but if someone could give me a bit of advice on this one I'd be very grateful.
I have a Grant Combi 90. On the pressure guage there is a wee red arrow pointing to 2 Bar. The pressure falls way down every so often and needs to be topped up from the water supply pipe every month or so using a manual valve.
This has been ok up to now, however a problem has now occurred. The black pressure arrow now rises above the red one when the boiler is turned on and water starts to discharge from the external overflow pipe.
I suspect this is a common problem but can someone tell me what it is likely to be and as that age old question goes...is it likely to be a big job to fix!
I have a Grant Combi 90. On the pressure guage there is a wee red arrow pointing to 2 Bar. The pressure falls way down every so often and needs to be topped up from the water supply pipe every month or so using a manual valve.
This has been ok up to now, however a problem has now occurred. The black pressure arrow now rises above the red one when the boiler is turned on and water starts to discharge from the external overflow pipe.
I suspect this is a common problem but can someone tell me what it is likely to be and as that age old question goes...is it likely to be a big job to fix!