Main System Eco HE boiler pressure too high


I have a Main Combi Eco 25, and it constantly displays “pressure to high” error. How can I repair it myself?


Hi Jack

All work perfomed on boilers should be done by GasSafe Registered personnel. In your case person will most probably turn off and isolate the boiler, remove the expansion vessel, empty it completely and finally recharge vessel using a compressor up to around 0.8-1 bar. Re-assemble and do all the checks