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hi everyone,could use some help with rinnai rl75i on demand water heater.the unit was installed one week ago,by a plumber friend ,it is only 6 months old.i got the unit for free because it was replaced because it got wet in a flood.the water only went as high as 2 in into the unit.when he first fired it up,it had code 11.he tried it about 5 times,and it ran good for about an hour-turning hot water off and on.it still is working,but every so often i get a code 12-flashing,and the alarm beeps.any avise i would be thankfull.i don;t feel at ease,because of it being gas.he thinks it might be a gas valve problem thanks bruce