Hi,
I'm running an open system with a baxi solo 2 PF40 boiler a Grundfos Selectric UPS 15/50 Central Heating Pump, in an S plan system (I have two separate drive valves).
The pump has been replaced in june of this year. The engineer did a full system drain down to fit etc. He used the wiring system from the previous pump. There were a few airlocks within the system which as far as I can tell have been cleared.
With regards to the boiler, I've had the Overheat and thermostat sensors replaced, along with the fan.
The heating system itself runs perfectly (as far as I can tell) in that all rad's get suitably hot and there are no cold spots within the system. The Hotwater is heated fine too.
I've got two problems currently.
1.) The pump is running continuously
2.) When the system is on its cooling down phase i.e the boiler has shut off there seems to be an influx of air/kettling within the flow pipe to the boiler.
My thoughts with regards to problem 1 is the PCB on the boiler, which controls the pump overrun, from what i've read about this boiler this seems to be a common issue!. I intend to get a gas safe engineer to replace the PCB (also have a look at the wiring too!)
Problem 2 is the one that baffles me.... Could problem 1 with the pump running continuously have a knock on effect and be bringing air into the system uneccessarily?! or is this a separate issue that could require another drain down to resolve?
Thoughts and help appreciated.
Simon
I'm running an open system with a baxi solo 2 PF40 boiler a Grundfos Selectric UPS 15/50 Central Heating Pump, in an S plan system (I have two separate drive valves).
The pump has been replaced in june of this year. The engineer did a full system drain down to fit etc. He used the wiring system from the previous pump. There were a few airlocks within the system which as far as I can tell have been cleared.
With regards to the boiler, I've had the Overheat and thermostat sensors replaced, along with the fan.
The heating system itself runs perfectly (as far as I can tell) in that all rad's get suitably hot and there are no cold spots within the system. The Hotwater is heated fine too.
I've got two problems currently.
1.) The pump is running continuously
2.) When the system is on its cooling down phase i.e the boiler has shut off there seems to be an influx of air/kettling within the flow pipe to the boiler.
My thoughts with regards to problem 1 is the PCB on the boiler, which controls the pump overrun, from what i've read about this boiler this seems to be a common issue!. I intend to get a gas safe engineer to replace the PCB (also have a look at the wiring too!)
Problem 2 is the one that baffles me.... Could problem 1 with the pump running continuously have a knock on effect and be bringing air into the system uneccessarily?! or is this a separate issue that could require another drain down to resolve?
Thoughts and help appreciated.
Simon