Alpha CB50 Pressure Problem

17 Nov 2018
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United Kingdom
I have a problem to solve with a Alpha CB50, the pressure rises within 1 minute to 3bar when heating is on, vessels are all pumped to correct manufacturer pressure.
Has anyone come across this fault?
The flow heats up, pump runs and hot water gets hot..

Many thanks Martyn.
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isolate the cold water inlet valve to the boiler and fire the heating, if the pressure still rises then you have an expansion problem, vessel or blocked communication, hose/pipe,if the pressure remains constant with the cold water inlet isolated the coil in the HW store has pinholed
Seems to be the EV, I have an 8ltr vessel, I will fit it externally to see if this solves the problem..
Many thanks Martyn.
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unlikely to be faulty to be honest, just re pressurise it properly and make sure the communication hose/ pipe is clear, so easy to over think this

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