Worcester Bosch · Greenstar i System Compact ErP
A1 281 boiler fault code
Greenstar 27i / 30i System Compact ErP
What A1 281 means
Pump stuck or running in air, little or no water in the system.
Gas Safe engineer: If the gauge is not below 1 bar, or A1 281 returns after following the pressure guidance, contact a Gas Safe registered engineer.
If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Safe check
Check the system pressure gauge. If it reads below 1 bar, follow the repressurising guidance to about 1.5 bar using the filling loop shown by your installer and the user guide, without removing any panel or casing. If it is not below 1 bar, or A1 281 returns, contact a Gas Safe registered engineer.
When to contact an engineer
If the gauge is not below 1 bar, or A1 281 returns after following the pressure guidance, contact a Gas Safe registered engineer.
Source and provenance
- Greenstar i System Compact ErP Installation & Service · 6 720 813 280 (2015/07) · §8.5 status/fault codes, printed pp. 62–63; Tables 35–36 locking/blocking codes, printed pp. 70–71
installation and service instructions
2015/07 · 6 720 813 280
- Greenstar i System Compact ErP User Instructions · 6 720 813 281 (2014/09) · §4 System Pressure, printed p. 11
user instructions
2014/09 · 6 720 813 281
After: Repressurise the boiler