I HAVE A HALSTEAD ACE BOILER WHICH IS/WAS NOT FIRING UP ON WATER OR HEATING. THE WIRING IS SOUND AND IT HAS HAD TWO NEW BOARDS BUT STILL NOTHING. AS A LAST RESORT I INCREASED THE PRESSURE TO 3 BAR INCASE THE GUAGE WAS FAULTY BUT NO RESPONSE. HOWEVER WHEN I RELEASED SOME PRESSURE VIA THE PRESSURE RELIEF VALVE IT SUDDENLY STARTED UP AND RAN UNTILL I TURNED IT OFF AT THE MAINS AND DID NOT FIRE UP WHEN SWITCHED BACK ON. DOES ANYONE KNOW WHICH PART SENSES SYSTEM PRESSURE ON THESE BOILERS?
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