Some advice please.
My Valliant Ecotec Pro boiler failed to turn on this morning with the fault led on.
The fault code was F.75 - "No pressure rise detected when turning on the pump"
The status code was S.97 - "water pressure sensor check is running"
The system pressure gauge was indicating about 1.5bar and the pump shaft was seen to be spinning behind the screw during the startup cycle, but the fault was still there after several resets.
I telephoned a plumber friend and he said he had experienced sensors becoming blocked by debris and that you could test them with a matchstick through the hole and measure the resistance across the contacts. I thought this would be worth a try before buying a new sensor.
I drained the system (was relieved to see clear water coming out) and removed the pressure sensor in the CH flow pipe (hoping that this was the right part). I carefully pushed a matchstick into the hole and felt a click but no more clicks after retrying and I hoped that I hadn't pushed the diaphram (?) beyond a point of no return.
It had three wires and I could only measure about 160kohm across two of the contacts, which didn't change with matchstick movement. It seemed likely that the sensor was a variable resistance type rather than a switched contact.
With nothing to lose I refitted the sensor and to my relief the boiler worked again. Maybe I had cleared a stuck condition of the sensor ?.
Does it sound like the sensor is on it's way out ?, has anyone else had similiar experiences ?
Am I right to assume that the sensor was the cause of the fault ?
I would be grateful for any advice
My Valliant Ecotec Pro boiler failed to turn on this morning with the fault led on.
The fault code was F.75 - "No pressure rise detected when turning on the pump"
The status code was S.97 - "water pressure sensor check is running"
The system pressure gauge was indicating about 1.5bar and the pump shaft was seen to be spinning behind the screw during the startup cycle, but the fault was still there after several resets.
I telephoned a plumber friend and he said he had experienced sensors becoming blocked by debris and that you could test them with a matchstick through the hole and measure the resistance across the contacts. I thought this would be worth a try before buying a new sensor.
I drained the system (was relieved to see clear water coming out) and removed the pressure sensor in the CH flow pipe (hoping that this was the right part). I carefully pushed a matchstick into the hole and felt a click but no more clicks after retrying and I hoped that I hadn't pushed the diaphram (?) beyond a point of no return.
It had three wires and I could only measure about 160kohm across two of the contacts, which didn't change with matchstick movement. It seemed likely that the sensor was a variable resistance type rather than a switched contact.
With nothing to lose I refitted the sensor and to my relief the boiler worked again. Maybe I had cleared a stuck condition of the sensor ?.
Does it sound like the sensor is on it's way out ?, has anyone else had similiar experiences ?
Am I right to assume that the sensor was the cause of the fault ?
I would be grateful for any advice
