The plate the head unit sits on is very rusty. I cleaned it up and can't feel any moisture anywhere.
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If its unvented:
1. I wouldn't replace with a motor on - motor off valve, they are not fail safe.
2. You shouldn't be working on it as you need a G3 qualification to do anything which affects the safety features, and that valve does.
1. I wouldn't replace with a motor on - motor off valve, they are not fail safe.
2. You shouldn't be working on it as you need a G3 qualification to do anything which affects the safety features, and that valve does.
Ah okay. What should I replace it with? 
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It turns out that the issue was with the brass valve that the Sunvic controls! I lifted up the Sunvic, quirted the valve with WD40, used pliers to turn it until it was free to move, put the Sunvic back on and now the Sunvic is quiet and is able to operate the value as it should.
Thanks everyone for the help
Thanks everyone for the help
DIYnot Local
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