I have searched the forum for information but do not find anything helpful.
I have a 10 year old Barcelona system boiler installed on a system with underfloor heating, radiators and DHW cylinder. There is no heat store, there is a primary circuit from which fluid is drawn for radiators UFH and cylinder.
There is a Tekmar 3635 controller running the system so the boiler gets a run signal from this only. The Tekmar runs the boiler pump. The pump starts before the boiler lights and runs on until there is no heat demand to the Tekmar from room stats or cylinder. So the pump runs on after the boiler shuts itself down.
All has been fine til recently. System still filled with inhibited fluid which is clear. Radiators do not bleed gas.
The expansion tank failed about a month ago and was replaced. A week later the control PCB failed (cooked components)
A new control PCB (5115164) with wiring harnes and for good measure new ignition board (241838) were fitted.
When boiler was switched on, it lit up, ran for 15 sec and shut down. Lit up in 5 sec, ran for 10 - 12 sec, shut down. NO RED LOCK-OUT
Since then we have replaced both Flow Temperature (red) and Safety Thermistors and the burner electodes.
It still lights/shuts down, lights/shuts down continuously. Water out hardly has time to warm up.
Shorting across the flow switch connections makes no difference. The breather pipe from the gas valve is clear. The burner box seal is good.
My boiler man is flummoxed and he thinks Baxi's are wonderful
Any idea's? Possibly low gas pressure due to faulty pressure govenor in the gas meter?
Now awaiting BG but not hopeful
Advices welcomed. Thanks. Jerry
I have a 10 year old Barcelona system boiler installed on a system with underfloor heating, radiators and DHW cylinder. There is no heat store, there is a primary circuit from which fluid is drawn for radiators UFH and cylinder.
There is a Tekmar 3635 controller running the system so the boiler gets a run signal from this only. The Tekmar runs the boiler pump. The pump starts before the boiler lights and runs on until there is no heat demand to the Tekmar from room stats or cylinder. So the pump runs on after the boiler shuts itself down.
All has been fine til recently. System still filled with inhibited fluid which is clear. Radiators do not bleed gas.
The expansion tank failed about a month ago and was replaced. A week later the control PCB failed (cooked components)
A new control PCB (5115164) with wiring harnes and for good measure new ignition board (241838) were fitted.
When boiler was switched on, it lit up, ran for 15 sec and shut down. Lit up in 5 sec, ran for 10 - 12 sec, shut down. NO RED LOCK-OUT
Since then we have replaced both Flow Temperature (red) and Safety Thermistors and the burner electodes.
It still lights/shuts down, lights/shuts down continuously. Water out hardly has time to warm up.
Shorting across the flow switch connections makes no difference. The breather pipe from the gas valve is clear. The burner box seal is good.
My boiler man is flummoxed and he thinks Baxi's are wonderful
Any idea's? Possibly low gas pressure due to faulty pressure govenor in the gas meter?
Now awaiting BG but not hopeful
Advices welcomed. Thanks. Jerry
