Baxi Air Cond error h4

[pricardof]

Helo

I have an air conditioning system from Baxi, it stopped being hot and Error H4, cold does it without a problem, I need help what could it be?

[frank]

See page 75 for the P6 error

https://mediacdn.baxi.co.uk/-/media/websites/baxiuk/files/product-literature/ashp-monobloc/baxi-assure-monobloc-installation-and-user-manual.pdf?la=en&v=1&d=20201105T131842Z&hash=B2679A63C6EA894B7BCED5D6B8BA0D7A