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Why would the boiler fault code be wrong (can it even happen guy`s?), Long shot but was there a time gap of days or weeks between taking the pressure reading and installing the boiler?
 
I know Potterton HE range (badged as Baxi and Main as well) inside out, as I fitted more than a good few and fixed about 4-5 of them). If it says E133, you can bet its telling you the truth, its not getting enough gas, Had a similar situation and had to call the gas provider, they sent a man in within the hour as he was nearby, changed the regulator on the meter and the boiler worked fine ever since. Nothing wrong with your boiler, stop swapping parts between them.
 
I know Potterton HE range (badged as Baxi and Main as well) inside out, as I fitted more than a good few and fixed about 4-5 of them). If it says E133, you can bet its telling you the truth, its not getting enough gas, Had a similar situation and had to call the gas provider, they sent a man in within the hour as he was nearby, changed the regulator on the meter and the boiler worked fine ever since. Nothing wrong with your boiler, stop swapping parts between them.
That's exactly what I was hoping to hear, however the regulator was changed right at the start when that message appeared and the gas supply has been tested a number of times, always reading safely above minimum, and still no joy.
 
What gas do they use in spain ? G20 probably not bet its bottled gas theres a clue maybe
 
If it wont fire up and run how can it be set up? chances are thats the problem you need a engineer who knows their stuff not a part swaper cheers kop.
 
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You have already had more advice than you should of had on a open forum Santajosep, and its time to say get a compent fully qualified gas engineer to sort this problem out regards kop
 
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