Worcester Greenstar 8000 - no hot water this morning.
I had a rough surprise this morning getting into the shower - no hot water.
I checked the pressure on the boiler screen and it was at 1.0 bar but the low pressure warning wasn’t on. I pulled the blue handle on the underside and I can hear water flowing inside the system but the pressure didn’t increase. I held it for a while but there was no change. I tried a few times but didn’t want to sit there endlessly filling it in case the pressure sensor wasn’t reading correctly and I ended up significantly over-pressurising it.
I changed the temperature on the thermostat to have the heating kick in, which it did fine. The pressure then started to increase on the display and when I checked the kitchen tap I had hot water again.
Any one know what might be up or is it time to call a professional?