its an myson boiler when its swicth on only the pump and fan goes on there is no problem on pcb i check those gas volbs its not make any sound,ill be apriceate if any body guide me what should i chack after
you can't usually hear gas volbs for the sound of the fan and water wooshing round. Don't worry about it. If it does bother you get a stethascope and see if you can hear it then. Let me know how it sounds I'ts never occured to me to listen to one. Glad your pcb is OK.
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