Hi all, I hope someone recognises this problem. I will waffle on a bit to try and give you all the information.
We have a Myson Midas Si combi boiler. It has an intermittent longstanding fault. Sometimes, when hot water has been running for, say, half a bath's worth, it gets into its head that there is insufficient air for 'complete combustion at high rate' and shuts down the burner to low power. The 'insufficient air' LED on the circuit board lights up. Result - lukewarm instead of hot water. Turning off the water allows the system to reset after about a minute.
BG have been out to it a number of times. It has had a new fan (no difference) and several new airflow detectors (sometimes better, sometimes worse). It has not had a new control board (well, not since this particular fault kicked in).
The airflow detector is a 1x1x2 inch thing attached to a 1/4 inch diameter tube going from somewhere 'flameside' with three wires which lead to the electronics.
The only thing that gives any kind of remission is to make sure the airflow detector tube is clear, seat the tube cleanly and firmly in the detector, and make sure the connections are sparkly and good.
Do these symptoms ring any bells with anyone? Does anyone know a permanent cure? After six good months, the cold baths are back
Thanks in advance.
We have a Myson Midas Si combi boiler. It has an intermittent longstanding fault. Sometimes, when hot water has been running for, say, half a bath's worth, it gets into its head that there is insufficient air for 'complete combustion at high rate' and shuts down the burner to low power. The 'insufficient air' LED on the circuit board lights up. Result - lukewarm instead of hot water. Turning off the water allows the system to reset after about a minute.
BG have been out to it a number of times. It has had a new fan (no difference) and several new airflow detectors (sometimes better, sometimes worse). It has not had a new control board (well, not since this particular fault kicked in).
The airflow detector is a 1x1x2 inch thing attached to a 1/4 inch diameter tube going from somewhere 'flameside' with three wires which lead to the electronics.
The only thing that gives any kind of remission is to make sure the airflow detector tube is clear, seat the tube cleanly and firmly in the detector, and make sure the connections are sparkly and good.
Do these symptoms ring any bells with anyone? Does anyone know a permanent cure? After six good months, the cold baths are back
Thanks in advance.
