hi,
this is my first post here so please be gentle.
I have an 8 year old Ideal Icos m3080 which has been working absolutely fine until yesterday when it started blowing 3.15A fuses.
Prior to commencing fault finding on the boiler I verified that all the other elements in the system (controller, tank stat, room stat, three port motor valve and external pump) were functioning correctly by running the system without the boiler connected. The external pump and all ancillaries draw no more than 0.44A even with the pump on position 3 (fastest).
I have identified that the boiler unit will power up and perform a self test showing a 0 on the LED panel provided I have nothing connected to the L2 terminal (black wire) forcing a call for heat. As soon as a mains voltage is present on the L2 terminal the 3.15A fuse blows instantly.
I have checked the mains filter although if this were faulty I think the unit would not power up. I also checked internally within the PCB for signs of damage/burning and could detect none at all. I checked the operation of the control temperature sensor and flue sensor by measuring resistance and warming the devices with my fingers. In each case the temperature began to drop indicating that the sensors are functioning.
I measured the internal pump (disconnected) for resistance/short and found 8~9Mohms between live-earth and neutral-earth but saw infinite resistance from Live-Neutral (?).
So, I am pretty stumped, not to mention cold, and wonder if any of you smart guys out there have any ideas what I can do to narrow down the cause of the issue.
Thanks in advance,
Mike
this is my first post here so please be gentle.
I have an 8 year old Ideal Icos m3080 which has been working absolutely fine until yesterday when it started blowing 3.15A fuses.
Prior to commencing fault finding on the boiler I verified that all the other elements in the system (controller, tank stat, room stat, three port motor valve and external pump) were functioning correctly by running the system without the boiler connected. The external pump and all ancillaries draw no more than 0.44A even with the pump on position 3 (fastest).
I have identified that the boiler unit will power up and perform a self test showing a 0 on the LED panel provided I have nothing connected to the L2 terminal (black wire) forcing a call for heat. As soon as a mains voltage is present on the L2 terminal the 3.15A fuse blows instantly.
I have checked the mains filter although if this were faulty I think the unit would not power up. I also checked internally within the PCB for signs of damage/burning and could detect none at all. I checked the operation of the control temperature sensor and flue sensor by measuring resistance and warming the devices with my fingers. In each case the temperature began to drop indicating that the sensors are functioning.
I measured the internal pump (disconnected) for resistance/short and found 8~9Mohms between live-earth and neutral-earth but saw infinite resistance from Live-Neutral (?).
So, I am pretty stumped, not to mention cold, and wonder if any of you smart guys out there have any ideas what I can do to narrow down the cause of the issue.
Thanks in advance,
Mike