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Hello my name is ***** ***** I look forward to helping you!
I am a Bosch factory trained and certified repair technician
It sounds like the water valve needs rebuilt.
The water valve has a diaphragm in it that engages the gas valve allowing the unit to light. If it has a build up on it or a hole it will not flex enough to engage the gas valve.
You are overriding the water valve. You can only get parts at www.houseneeds.com.
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Good luck and thank you for using JustAnswer.
Well, are you needing more help or are you satisfied with my answer?
I am sorry I am at a loss. Its so hard to diagnose remotely.
I can opt out and allow some one else to answer you!