14-07-2015, 09:21 PM
If you're turning the relief valve and nothing is coming out there's no water getting to the heater
I could be the non return valve is faulty or the strainer is blocked.
Is the service valve feeding the heater fully open?
Tbh you shouldn't be touching any of it, unvented water heaters can cause catastrophic damage if they're done wrong.
Whole schools have been blown apart by faulty unvented water heaters
Seriously of you don't know what you're doing with it I wouldn't be touching it.
When you saying replenishing the air gap worries me.
There is no air gap.
The expansion vessel is set to a certain pressure to maintain a constant pressure when you turn the tap on
Also if there's no water getting to the heater chances are you've cooked it
Can you take a picture of it to see what setup you have
I could be the non return valve is faulty or the strainer is blocked.
Is the service valve feeding the heater fully open?
Tbh you shouldn't be touching any of it, unvented water heaters can cause catastrophic damage if they're done wrong.
Whole schools have been blown apart by faulty unvented water heaters
Seriously of you don't know what you're doing with it I wouldn't be touching it.
When you saying replenishing the air gap worries me.
There is no air gap.
The expansion vessel is set to a certain pressure to maintain a constant pressure when you turn the tap on
Also if there's no water getting to the heater chances are you've cooked it
Can you take a picture of it to see what setup you have