Any one know what these symbols mean on my Vaillant Ecotech boiler...

[Steveb21]

Loss of hot water and central heating.

The circled icons are new to me... ive had a look at the manual and i cant figure out what they refer to.
After they flash for approx 30 secs the F33 code appears:

f 33 Main heat exchanger anti freeze protection mode Check air pressure switch, fan, fan supply or flue.
(837/637 only) due to no switching signal from the air pressure switch system.


Thank you.

 

[jeff the gasman]

You need a gas safe engineer for that Steve.
Or a fixed price Vaillant repair.

 

[Steveb21]

Update: The fan had packed in and has now been replaced by an engineer. All working. Thanks.