How to use your Vaillant Air Source Heat Pump
Bleeding your radiators
Air source heat pump systems are very similar to boiler central heating and may sometimes require air from the radiators to be vented. When doing so, this can cause the system pressure to drop meaning that your air source heat pump may stop working.
If this happens; "Low water pressure" be displayed on your programmer screen. Contact you're the Housing Service on 01597 827464 for advice to resolve this.
Some air source heat pump installations also contain glycol to prevent the pipes installed to the outside unit from freezing. Radiators fitted to glycol systems should only be vented by qualified personnel trained in its handling.