It's been a while for this update, until recently the heating has been fine and the H/W still hit and miss. Now we have neither again. 3 videos below that may or may not help.
A new DHW Flow Switch + Microswitch was fitted last year and seems to be operating fine. HW Demand LED lights okay on demand.
The pilot is fine and stays on now. Last year I bent the thermocouple a little towards the flame as the fan was constantly blowing it out.
The Problem Now.
Turning on the hot tap doesn't make the boiler fire up. The pilot is on and the fan appears to be working. The hot tap flow is ok/poor and then after 10/15 seconds flow gets very very slow accompanied by a rising whooshing water sound coming fron the boiler. The whooshing used to continue for 10/15 seconds before the water heated up, the whooshing would stop and the flow would get better. Now it doesn't do that, just continues to whoosh and the boiler fails to fire. Can hear 'whooshing' half way through video 3 http://uk.video.yahoo.com/video/play?vid=1799198
Turning the heating to constant doesn't make the boiler fire up either. The pilot is on and the fan appears to be working.
Other fault finding I've done: The PCB had dry/loose solder joints at resistors R1 & R2. I've cleaned & re-soldered them. The resistors themselves may have failed though? If you think they may relate to the problem I can easily replace them if you can tell me their rating.
Any ideas gents. 3 AVI's below.
http://uk.video.yahoo.com/video/play?vid=1799083
http://uk.video.yahoo.com/video/play?vid=1799120
http://uk.video.yahoo.com/video/play?vid=1799198
A new DHW Flow Switch + Microswitch was fitted last year and seems to be operating fine. HW Demand LED lights okay on demand.
The pilot is fine and stays on now. Last year I bent the thermocouple a little towards the flame as the fan was constantly blowing it out.
The Problem Now.
Turning on the hot tap doesn't make the boiler fire up. The pilot is on and the fan appears to be working. The hot tap flow is ok/poor and then after 10/15 seconds flow gets very very slow accompanied by a rising whooshing water sound coming fron the boiler. The whooshing used to continue for 10/15 seconds before the water heated up, the whooshing would stop and the flow would get better. Now it doesn't do that, just continues to whoosh and the boiler fails to fire. Can hear 'whooshing' half way through video 3 http://uk.video.yahoo.com/video/play?vid=1799198
Turning the heating to constant doesn't make the boiler fire up either. The pilot is on and the fan appears to be working.
Other fault finding I've done: The PCB had dry/loose solder joints at resistors R1 & R2. I've cleaned & re-soldered them. The resistors themselves may have failed though? If you think they may relate to the problem I can easily replace them if you can tell me their rating.
Any ideas gents. 3 AVI's below.
http://uk.video.yahoo.com/video/play?vid=1799083
http://uk.video.yahoo.com/video/play?vid=1799120
http://uk.video.yahoo.com/video/play?vid=1799198