Worcester Bosch Greenstar CDi Classic System ErP fault E9
Safety temp. limiter in CH flow has tripped
Gas boilerWhat it means
The safety temperature limiter in the central heating flow circuit has tripped, indicating an over-temperature condition.
Likely causes
- Low system pressure
- Faulty safety temp. limiter
- Faulty pump operation
- Blown fuse on PCB
- Air in appliance
Where to start
- Check system pressure
- Check safety temp. limiters
- Check pump operation
The full answer, free
- 2 more checks in order
- How to put it right, step by step
- The manual page for this fault (page 52), right under the answer
Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.
From the Worcester Bosch manual for the Greenstar CDi Classic System ErP. Check the model on the data plate before you order parts.