S
skinflint
Hello. I have a WB Highflow 400 RSF, which was installed in 1999 and is covered by a maintenance contract with British Gas.
I recently called BG out because the "Safety Temperature Limiter Thermostat" keeps tripping. This occurs when the CH is OFF but the HW is on. We only know about it when we come to turn on the HW tap and find it running cold. It doesn't trip after the HW has been running ror a while.
BG advised that the most likely cause was 'sludge/muck' in the water to water heat exchanger and that I would need to have my system power flushed before they could repair. They also advised that I have a MagnaBooster (magnetic filter) fitted. The cost of this work was quoted at £709.
However, I am not convinced that sludge/muck is the problem. I have 14 radiators, 3 towel rails and a plinth heater on my system. All heat up evenly with no cold spots whatsoever. Water runs perfectly clear from the bleed valves of the radiators and also the drain valve of one downstairs radiator that I tested. There is no sign of sludge in the system! If it weren't for the presence of inhibitor in the water I'd be happy to drink it!
So, what else could be the cause of the thermostat tripping? Limescale? I live in Macclesfield which has medium to moderately hard water but we don't suffer too much from scale. We have also had a magnetic descaler fitted to the system since new. Are there any other potential causes and what can be done to find the real cause of the overheating? Is it possible the thermostat itself is faulty?
Any advice you can give would be gratefully received. Thanks
I recently called BG out because the "Safety Temperature Limiter Thermostat" keeps tripping. This occurs when the CH is OFF but the HW is on. We only know about it when we come to turn on the HW tap and find it running cold. It doesn't trip after the HW has been running ror a while.
BG advised that the most likely cause was 'sludge/muck' in the water to water heat exchanger and that I would need to have my system power flushed before they could repair. They also advised that I have a MagnaBooster (magnetic filter) fitted. The cost of this work was quoted at £709.
However, I am not convinced that sludge/muck is the problem. I have 14 radiators, 3 towel rails and a plinth heater on my system. All heat up evenly with no cold spots whatsoever. Water runs perfectly clear from the bleed valves of the radiators and also the drain valve of one downstairs radiator that I tested. There is no sign of sludge in the system! If it weren't for the presence of inhibitor in the water I'd be happy to drink it!
So, what else could be the cause of the thermostat tripping? Limescale? I live in Macclesfield which has medium to moderately hard water but we don't suffer too much from scale. We have also had a magnetic descaler fitted to the system since new. Are there any other potential causes and what can be done to find the real cause of the overheating? Is it possible the thermostat itself is faulty?
Any advice you can give would be gratefully received. Thanks