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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Interesting Boiler Problem
I have an oil boiler, HR Wallstar which stops when it is most needed.
Typically it will fire up in the morning and heat up the house etc. Then with the Amber light still lit and demand from the thermostats it will simply stop. The thermostat on the boiler is not tripping out and the boiler stays off even when everything is well cold. The thermostat on the boiler is up high. this only happens when it is really cold, suggesting that may be the boiler is doing a bit of overtime and something is cutting out. The 'lock out' relay is not operating so oil shortage is probably not the issue...? When in this stopped state I power off the isolator and power it up again it will start the ignition cycle very briefly and then stop. After an hour or two it comes back on and works OK for a while. Typically on warmer days it doesn't seem to go wrong. The boiler service man can't find a fault. Any ideas?? Jay |
#2
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Interesting Boiler Problem
"Jay" wrote in message ... I have an oil boiler, HR Wallstar which stops when it is most needed. Typically it will fire up in the morning and heat up the house etc. Then with the Amber light still lit and demand from the thermostats it will simply stop. The thermostat on the boiler is not tripping out and the boiler stays off even when everything is well cold. The thermostat on the boiler is up high. this only happens when it is really cold, suggesting that may be the boiler is doing a bit of overtime and something is cutting out. The 'lock out' relay is not operating so oil shortage is probably not the issue...? When in this stopped state I power off the isolator and power it up again it will start the ignition cycle very briefly and then stop. After an hour or two it comes back on and works OK for a while. Typically on warmer days it doesn't seem to go wrong. The boiler service man can't find a fault. Any ideas?? Jay Check the oil feed line - is much of it exposed outside? There *may* be a little drop of water trapped in the line that will settle at the lowest point, and if in an exposed part of the run may freeze on occasion causing starvation. Just a thought. Dave |
#3
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Interesting Boiler Problem
In message , Jay
writes I have an oil boiler, HR Wallstar which stops when it is most needed. Typically it will fire up in the morning and heat up the house etc. Then with the Amber light still lit and demand from the thermostats it will simply stop. The thermostat on the boiler is not tripping out and the boiler stays off even when everything is well cold. The thermostat on the boiler is up high. this only happens when it is really cold, suggesting that may be the boiler is doing a bit of overtime and something is cutting out. The 'lock out' relay is not operating so oil shortage is probably not the issue...? When in this stopped state I power off the isolator and power it up again it will start the ignition cycle very briefly and then stop. After an hour or two it comes back on and works OK for a while. Typically on warmer days it doesn't seem to go wrong. The boiler service man can't find a fault. Any ideas?? Interesting post. I repaired an oil control module for someone a couple of weeks ago and it's come back with the same problem. The customer has tried putting it in the fridge and then installing it, then heating the module and then installing it. It seems that it won't work when very cold (which sort of defeats the object) I'll be getting the freezer spray out tomorrow to investigate -- geoff |
#4
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Interesting Boiler Problem
geoff wrote:
In message , Jay writes I have an oil boiler, HR Wallstar which stops when it is most needed. Typically it will fire up in the morning and heat up the house etc. Then with the Amber light still lit and demand from the thermostats it will simply stop. The thermostat on the boiler is not tripping out and the boiler stays off even when everything is well cold. The thermostat on the boiler is up high. this only happens when it is really cold, suggesting that may be the boiler is doing a bit of overtime and something is cutting out. The 'lock out' relay is not operating so oil shortage is probably not the issue...? When in this stopped state I power off the isolator and power it up again it will start the ignition cycle very briefly and then stop. After an hour or two it comes back on and works OK for a while. Typically on warmer days it doesn't seem to go wrong. The boiler service man can't find a fault. Any ideas?? Interesting post. I repaired an oil control module for someone a couple of weeks ago and it's come back with the same problem. The customer has tried putting it in the fridge and then installing it, then heating the module and then installing it. It seems that it won't work when very cold (which sort of defeats the object) I'll be getting the freezer spray out tomorrow to investigate I had a very old boiler that used to do this. Would get worse and worse, maybe locking out as well. It was always a carboned up nozzle and carbon on the pghotodetctor that detected the flame. Its probably worth servicing both items anyway, but if it persists, its something in the control circuits as geoff says. |
#5
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Interesting Boiler Problem
In message , The Natural Philosopher
writes geoff wrote: In message , Jay writes I have an oil boiler, HR Wallstar which stops when it is most needed. Typically it will fire up in the morning and heat up the house etc. Then with the Amber light still lit and demand from the thermostats it will simply stop. The thermostat on the boiler is not tripping out and the boiler stays off even when everything is well cold. The thermostat on the boiler is up high. this only happens when it is really cold, suggesting that may be the boiler is doing a bit of overtime and something is cutting out. The 'lock out' relay is not operating so oil shortage is probably not the issue...? When in this stopped state I power off the isolator and power it up again it will start the ignition cycle very briefly and then stop. After an hour or two it comes back on and works OK for a while. Typically on warmer days it doesn't seem to go wrong. The boiler service man can't find a fault. Any ideas?? Interesting post. I repaired an oil control module for someone a couple of weeks ago and it's come back with the same problem. The customer has tried putting it in the fridge and then installing it, then heating the module and then installing it. It seems that it won't work when very cold (which sort of defeats the object) I'll be getting the freezer spray out tomorrow to investigate I had a very old boiler that used to do this. Would get worse and worse, maybe locking out as well. It was always a carboned up nozzle and carbon on the pghotodetctor that detected the flame. Its probably worth servicing both items anyway, but if it persists, its something in the control circuits as geoff says. I have a theory .... Maybe it's condensation. I have liberally sprayed the pcbs with conformal coating and tomorrow I'll attack it with freezer spray again. -- geoff |
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