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Hey all I hope you can help.
We have an eco etc plus 438 boiler with a evocyl water tank upstairs.
We have two vaillant thermostats, the vr720 and vr92 with weather compensation.
There are two heating zones. With 8 rads upstairs 5 downstairs.
Lately the boiler seems to drop to 50 and go up to 70 every 3 minutes or so.
Any ideas on what this could be please?
Many thanks
We have an eco etc plus 438 boiler with a evocyl water tank upstairs.
We have two vaillant thermostats, the vr720 and vr92 with weather compensation.
There are two heating zones. With 8 rads upstairs 5 downstairs.
Lately the boiler seems to drop to 50 and go up to 70 every 3 minutes or so.
Any ideas on what this could be please?
Many thanks
