hello everyone, have a problem i hope someone can help with.
I have a vaillant ecotec pro 28 showing fault code f75. have taken out the water pressure sensor and got a bit of dirt from it and then changed it from the old pink one to a black one. I have cleaned the filter behind the water pressure sensor and checked the pump for resistance which was 230 ohms. Im getting 240v from the timer to the pcb but when i reset the boiler with my meter across live and neutral on the pump i wasnt getting any voltage before it locked out on f75- which takes about 20 seconds.
So i changed the pcb on the advice of a 'vaillant tech'. Still getting f75 so i tried the wiring lumes still getting f75.
Please help.
Simon b
I have a vaillant ecotec pro 28 showing fault code f75. have taken out the water pressure sensor and got a bit of dirt from it and then changed it from the old pink one to a black one. I have cleaned the filter behind the water pressure sensor and checked the pump for resistance which was 230 ohms. Im getting 240v from the timer to the pcb but when i reset the boiler with my meter across live and neutral on the pump i wasnt getting any voltage before it locked out on f75- which takes about 20 seconds.
So i changed the pcb on the advice of a 'vaillant tech'. Still getting f75 so i tried the wiring lumes still getting f75.
Please help.
Simon b