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hi i am dan i can help you with this. was the diagnosis that it was not opening at all or just not enough?
this is a picture of a standard gas valve to test to see if the valve is opening he should check the outlet port of the valve and the inlet port of the valve to make sure there is enough gas pressure to the valve. did he check the pressure here
yes if it was not opening it would be zero. if he got some pressure ther the problem is not the gas valve. it may have a restriction or problem in the gas supply to test this he needs to check the inlet pressure when it starts up to make sure it does not drop bellow 5" WC
do you have other appliances that run on gas in the house and if so do they work properly
do you know what the pressure was he got on each side?
is it natural gas or propane? if natural gas then that is not right. there will only be about 3.5" WC on the manifold side
ok that sounds good. but you said he did read pressure when the valve opens so it is most likely opening and there is a restriction in the gas line. make sure the gas shut off valve is open all the way, if it is then turn it off remove the pipe if possible and check inside the pipes to remove any debris and inside the gas valve there is a screen that may be blocked.
ok also have them check the inlet pressure at the valve when it tries to open to see if it drops below 5" wc. if it does then the problem is not the valve. if you have any more questions please let me know. if not i would appreciate it if you could rate me on my service today and thank you for using just answer.
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