Baxi 105e problems

[notnochippy]

Hi all, I drained down my heating system to relocate a radiator, ever since when trying to use the shower on the second floor( boiler located on ground floor) boiler stops working, fault light- pump or low pressure comes on. Any advice on how I can fix this please.
Cheers in advance

 

[cross thread]

Top pressure to 1 bar and vent the pump and check auto air bleed is open

 

[notnochippy]

Thank you for your swift response, unfortunately it didn't work, any other suggestions gratefully received?

 

[durhamplumber]

Thank you for your swift response, unfortunately it didn't work, any other suggestions gratefully received?

Have you reset the boiler?

 

[notnochippy]

Yes tried that. Hot water works on ground floor when heating is on but very intermittent on second floor? All worked perfectly fine until I drained down and refilled system?

 

[ianmcd]

Did you put all the zone valves into the man open position when re-filling ?