Hi,
I had a BIASI RIVA COMPACT HE M96.28SR/C boiler fitted about 3 years ago by a Corgi registered boiler engineer, every radiator was also replaced as was most pipe work. The hot water started to run hot and then cold for at about 20 second intervals and we can no longer use our shower or bath, I have replaced the DHW/HE as this seemed blocked with black debris, I have also replaced the microswitch and small membrane but the plunger does not come out when the hot water is turned on so I have had to put a nail in the microswitch for the time being. Have you any idea why the hot water is running HOT/COLD/HOT and the plunger is not working?
I had a BIASI RIVA COMPACT HE M96.28SR/C boiler fitted about 3 years ago by a Corgi registered boiler engineer, every radiator was also replaced as was most pipe work. The hot water started to run hot and then cold for at about 20 second intervals and we can no longer use our shower or bath, I have replaced the DHW/HE as this seemed blocked with black debris, I have also replaced the microswitch and small membrane but the plunger does not come out when the hot water is turned on so I have had to put a nail in the microswitch for the time being. Have you any idea why the hot water is running HOT/COLD/HOT and the plunger is not working?