Firebird combi xceed oil boiler

I recently fitted a new boiler i have limited knowledge when the mains water is turned on and the filling loop is disconnected the boiler pressure continues to rise any help as to whats wrong please

Asked by David on 27th Jul 2026
Expert Trade Answers
"If you’re referring to the pressure rising when it’s in use that’s completely normal. Pressure will rise as the flow and returns get up to temperature.
If it’s rising without the boiler being in use, I’d assume that the cold mains has been mistakenly piped into the flow and return pipework somewhere."
Answered on 27th Jul 2026 - Member since Feb 2024 - report
"It is quite clear that the boiler has been incorrectly pipes up
Possibly cold supply to the hot outlet"
Answered on 27th Jul 2026 - Member since May 2023 - report
"I would suggest getting a engineer to look at it, as it seems its been piped up wrong the gauge is rising, possibly cold pipe connected to flow or return"
Answered on 27th Jul 2026 - Member since Jan 2025 - report
"You need to book a gas engineer to visit your property and diagnose the issues"
Answered on 27th Jul 2026 - Member since Jun 2024 - report
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