Viessmann Vitocal 222-A heat pump system - Hot water but heating cool

[viessman user 123]

Hi,

I have run into some issues with my heating over the past few weeks. I have a Viessmann Vitocal 222 with heat pump system, the hot water seems to be working fine at 45 degrees but the heating isn't getting any hotter than 32 Celsius. The radiators are barely getting any warmer than if the heating was off and the underfloor system isn't much better.

So far I have tried:
- Adjusting the heat curve to push the floe to be hotter
- Changing the room temperature on the unit to 25 degrees (higher than it should need to be)
- Manually moving the diverter valve so it is on heating rather than hot water
- Bleeding all radiators and repressurising back over 1 bar
- Taking one radiator off that was cold on the lower half and flushing it out.
- Reducing the hot water to 10 degrees so the system will focus on heating.

None of these have had any impact at all, the heating flow temperature remains between 29 and 32 degrees.

Any suggestions welcomed, I am going to reach out to Viessmann directly next week but wanted to check if there is anything else that could be the cause.
Thanks!