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yes i agree with what you are saying but if there are any electrical tests i can do to try and determin if its pcb then i will have a go myself if its defo the gas then i can get somone in.

im think that if it gets to igniting the pressure switch is working.

it does it straight from stone cold now though, makes no difference if heating or water either

before it got to this stage it was working apart from it was constantly randomly igniting even though it was burning.

worcester bosch 28 cdi rsf. it ignites full burner on but carries on igniting then goes to burner lockout. i fitted new flame sensor and checked continuity of the cable to the multi plug. how can i test if it is gas valve or pcb? or is it something else?