Halstead ace high

[jollyrodger2]

Can anybody tell me what senses the pressure in a halstead ace high as i have no leaks in my house or on the boiler but every other day it locks out and i have to increase the pressure to get the boiler to fire in either mode hot water or heating from 1.5 bar to 3 bar , is it he diaphram
Regards jolly rodger 2

 

[snb]

are you sure you have no leaks? have you checked the prv outside?

 

[jollyrodger2]

Yes i have checked for leaks , the system pressure does not drop but when it locks out i have to increase the pressure , re set ,and it will work for a few a day, then lock out , i try to re set, it fails , then i increase the pressure and it fires this has happened for the past couple of days , Does the diaphram sense the pressure.

 

[ChrisR]

Check the air vent's open/working, and bleed the pump just in case.
Boiler won't go if the pump has no water to pump.