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  1. J

    Alpha CB28X loosing pressure after CH program.

    Quick update, New PRV finally made it from Leeds, took 15mins to fit. Job's a good 'un. Been running for two days now on programe morning and night, no problems.
  2. J

    Alpha CB28X loosing pressure after CH program.

    Update. Firstly, the boiler is a CB28X, I was reading a thread about a C27 to see if it was relavent and I posted that model number. Not enough coffee before posting methinks. I disconnected the PRV outlet pipe and pointed it at a bucket, isolated the rad circuit and filled the boiler to...
  3. J

    Alpha CB28X loosing pressure after CH program.

    Hi DIYnotters, First post so be kind! I have an Alpha C27 EDIT:CB28X combi which keeps loosing pressure. If I fill it to the cold green 'normal' pressure, it will run for days on end, but once the CH demand turns off, the pressure drops almost to zero. This hasn't been too bad over the...
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