Hi I have a mynule 14 se boiler. The problem is the water pressure keeps dropping to 0 when the heating and hot water are turned off I have tried topping it back up to one and a half but when I turn the heating or hot water on the pressure goes up past 4 and then turn it off it will drop back to 0. Any body any ideas what could be wrong?
Pressure going over 4, you have ablockage some where most over pressure valves are rated at 3.5, so above 3,5. the system will vent water out of overflow, So when cold, pressure is 0, Check your pump
