good evening, I've got an issue with my ancient however well maintained ferroli 901 boiler, it short cycles, it stays on for 35 seconds, then shuts off for approx 10 seconds and repeats all day, this never happened last winter, just this winter since turning it back on.
When turned on is fine, however after approx 10 minutes when up to temp issue starts
This is what I have done so far,
2 new thermisters.
New pcb
New flow meter
Water runs hot / cold, however this is due to the short cycling
I have been told as soft water area unlikely to be heat exchanger.
All rads are warm all over,
No airlocks in rads or taps.
Pump is working well because rads get hot quickly.
Any ideas please, I would appreciate any advice,
I appreciate ferrolis aren't the best
Thanks
When turned on is fine, however after approx 10 minutes when up to temp issue starts
This is what I have done so far,
2 new thermisters.
New pcb
New flow meter
Water runs hot / cold, however this is due to the short cycling
I have been told as soft water area unlikely to be heat exchanger.
All rads are warm all over,
No airlocks in rads or taps.
Pump is working well because rads get hot quickly.
Any ideas please, I would appreciate any advice,
I appreciate ferrolis aren't the best
Thanks