Hi
I'm experiencing some problems with my Baxi 105e (non condensing)
We had a new expansion tank fitted but now we've started using it again we've a couple of problems.
When the CH is working the pressure jumps about 2 bar and if it's been topped up to around 1.5 (incoming water pressure) then the PRV valve opens due to the pressure going above 3 and water is vented slowly. When the CH is off the pressure guage then has dropped to 0. Carefully filling the boiler to less than 1 bar helps solve this problem but still doesn't seem right.
The boiler heats up ok, rads get heated but then the boiler will shut off for a while before firing back up again. The problem is that the rads have cooled too much so are tepid by the time it kicks back in. Changing the temp doesn't seem to make the boiler fire up any quicker but resetting the boiler does. During this process I've notice the return pipe at the boiler doesn't seem to be anywhere near the same heat as the flow pipe which is really hot at the boiler.
When using the boiler it makes a rather loud humming sound.
A basic balancing of the system was done after the downstairs rads were taken off and cleaned out but to get the heat where we wanted it the lounge rads have had to have their lock valves left more or less wide open.
I'm thinking this may be the symptons of a pump that is not pumping enough in combination with some other pressure problem. I gave the plumber a hand when he installed the expansion vessel (he managed to do it without removing the boiler from the wall) and he installed without adjusting the expansion tank precharge pressure.
Any help appreciated, thanks.
I'm experiencing some problems with my Baxi 105e (non condensing)
We had a new expansion tank fitted but now we've started using it again we've a couple of problems.
When the CH is working the pressure jumps about 2 bar and if it's been topped up to around 1.5 (incoming water pressure) then the PRV valve opens due to the pressure going above 3 and water is vented slowly. When the CH is off the pressure guage then has dropped to 0. Carefully filling the boiler to less than 1 bar helps solve this problem but still doesn't seem right.
The boiler heats up ok, rads get heated but then the boiler will shut off for a while before firing back up again. The problem is that the rads have cooled too much so are tepid by the time it kicks back in. Changing the temp doesn't seem to make the boiler fire up any quicker but resetting the boiler does. During this process I've notice the return pipe at the boiler doesn't seem to be anywhere near the same heat as the flow pipe which is really hot at the boiler.
When using the boiler it makes a rather loud humming sound.
A basic balancing of the system was done after the downstairs rads were taken off and cleaned out but to get the heat where we wanted it the lounge rads have had to have their lock valves left more or less wide open.
I'm thinking this may be the symptons of a pump that is not pumping enough in combination with some other pressure problem. I gave the plumber a hand when he installed the expansion vessel (he managed to do it without removing the boiler from the wall) and he installed without adjusting the expansion tank precharge pressure.
Any help appreciated, thanks.