When using DHW my boiler used to fire up, work at full speed for just a few seconds, then slow down and work at a low speed the rest of the time, delivering hot water at constant temperature.
Now it fires up, works at full speed all the time, never slows down, and after ca. 30 seconds makes loud boiling noises and switches off. Then, after a short break it switches on again for another few seconds. The cycle (15 seconds on - 15 seconds off) repeats for a few minutes when the boiler switches off completely with error 02 (Flue System obstruction).
I don't believe there is a flue system obstruction as CH seems to be working fine all day.
Thanks in advance for any help.
Now it fires up, works at full speed all the time, never slows down, and after ca. 30 seconds makes loud boiling noises and switches off. Then, after a short break it switches on again for another few seconds. The cycle (15 seconds on - 15 seconds off) repeats for a few minutes when the boiler switches off completely with error 02 (Flue System obstruction).
I don't believe there is a flue system obstruction as CH seems to be working fine all day.
Thanks in advance for any help.
