Hi All,
I've read through most of the posts on here about Boiler tripping electric circuits but none of them quite applies to my issue.
I have a Ideal Logic gas boiler, with a gravity-fed hot water cylinder, a programmable Siemens Boiler controller and Siemens thermostat. The cylinder has an immersion heater, which is turned off, however shares the central heating eletrical circuit. A Three-port-valve is installed. In the last month, an engineer attended to try and triage issues, and replaced the TP Valve motor. There's a Magnaclean Micro 2 in the water loop.
The house is currently being refurbished, and nothing has changed except some of the radiators are not connected at the moment, though the disconnected rads comprise about 35% of the total central heating loop's water volume.
Recently, we've been having some significant issues, narrowed down to these two situations:
1. Turning on the hot water channel on the boiler controller started causing the RCD to trip, randomly - never the same amount of time. Anywhere between instantly (if CH had been running prior) and 10 minutes (from cold) which leads to point 2
2. Turning the central heating on and setting the heat knob to anyting over approximately 45 degrees (about a third over minimum temp on the dial) ends up tripping the RCD as well. Again this will happen anything between 2-14 minutes after starting the boiler (my guess is as it reaches temperature)
I have bled the system, checked for leaks wherever possible and found none. The electrical circuits are in tact as far as I can see - there hasn't been any work close to where they are run. I cleaned the MagnaClean filter and that wasn't very dirty to start off with. Pressure is 1 bar when cold, 1.5 bar when heating.
I've had 2 different professionals visit, one of them from a renowned plumbing company who just arrived, said I should buy a combi-boiler, and charged me for the visit, the other running extensive tests but not finding anything specific - he replaced the TP Valve motor hoping it would fix the problem. He checked the boiler pump itself and said it's fine.
Further searches and having spoken to the last engineer who visited points to possibly:
1. The water pump in the boiler, but wouldn't this trip the RCD the moment it starts?
2. The three-port valve possibly getting stuck, but would this not also cause a quicker RCD trip, and what relevance would it have to the boiler tripping the RCD if the boiler temp is set to normal range (eco mode is approximately 65 Degrees C)?
I need to call someone out to come and fix it but I don't know if I should do any further detailed checks first, and would very much prefer to have good guidance on what could be the root cause before I get anyone out which involves additional cost.
Any advice would be hugely appreciated.
v
I've read through most of the posts on here about Boiler tripping electric circuits but none of them quite applies to my issue.
I have a Ideal Logic gas boiler, with a gravity-fed hot water cylinder, a programmable Siemens Boiler controller and Siemens thermostat. The cylinder has an immersion heater, which is turned off, however shares the central heating eletrical circuit. A Three-port-valve is installed. In the last month, an engineer attended to try and triage issues, and replaced the TP Valve motor. There's a Magnaclean Micro 2 in the water loop.
The house is currently being refurbished, and nothing has changed except some of the radiators are not connected at the moment, though the disconnected rads comprise about 35% of the total central heating loop's water volume.
Recently, we've been having some significant issues, narrowed down to these two situations:
1. Turning on the hot water channel on the boiler controller started causing the RCD to trip, randomly - never the same amount of time. Anywhere between instantly (if CH had been running prior) and 10 minutes (from cold) which leads to point 2
2. Turning the central heating on and setting the heat knob to anyting over approximately 45 degrees (about a third over minimum temp on the dial) ends up tripping the RCD as well. Again this will happen anything between 2-14 minutes after starting the boiler (my guess is as it reaches temperature)
I have bled the system, checked for leaks wherever possible and found none. The electrical circuits are in tact as far as I can see - there hasn't been any work close to where they are run. I cleaned the MagnaClean filter and that wasn't very dirty to start off with. Pressure is 1 bar when cold, 1.5 bar when heating.
I've had 2 different professionals visit, one of them from a renowned plumbing company who just arrived, said I should buy a combi-boiler, and charged me for the visit, the other running extensive tests but not finding anything specific - he replaced the TP Valve motor hoping it would fix the problem. He checked the boiler pump itself and said it's fine.
Further searches and having spoken to the last engineer who visited points to possibly:
1. The water pump in the boiler, but wouldn't this trip the RCD the moment it starts?
2. The three-port valve possibly getting stuck, but would this not also cause a quicker RCD trip, and what relevance would it have to the boiler tripping the RCD if the boiler temp is set to normal range (eco mode is approximately 65 Degrees C)?
I need to call someone out to come and fix it but I don't know if I should do any further detailed checks first, and would very much prefer to have good guidance on what could be the root cause before I get anyone out which involves additional cost.
Any advice would be hugely appreciated.
v
