Bosch Boiler Error Codes
A plain-English reference to 16 common Bosch fault codes — what each means, what causes it, and when to call a licensed BC gas technician.
Bosch Greenstar boilers display alphanumeric fault codes (such as EA, C7 or CE) on the digital control. Bosch builds reliable, high-efficiency units, and the code points straight to the affected system. This reference explains the common Bosch fault codes and why flame, fan, gas and venting faults must be diagnosed by a licensed BC gas technician.
Smell gas? Leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Never bypass a safety lockout or attempt gas work yourself — in BC it must be done by a licensed gas fitter.
Ignition fault
Flame failure
Over-temperature / high-limit
Temperature-sensor fault
Air-pressure / venting fault
Combustion-fan fault
System water-pressure fault
Water-flow / circulation fault
Communication fault
Control-board (PCB) fault
Bosch error codes — FAQ
Why is my Bosch boiler showing an error code?
Bosch boilers display a fault code when a safety circuit detects a problem — for example with ignition, flame, water flow, temperature or venting. The code points to the affected system. The boiler shuts down to protect itself; a licensed technician then diagnoses the true root cause before repair.
Can I just reset my Bosch boiler?
A single reset after a one-off event is usually fine, but repeated resets without fixing the cause can be unsafe — especially for ignition, gas and venting faults — and can cause further damage. If the code returns, switch the boiler off and call GasBoilers.ca at 604-359-1081.
Do you repair all Bosch boiler models in Greater Vancouver?
Yes. Our Red Seal–certified, gas-licensed technicians service Bosch Greenstar and Singular series across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available.
Error codes by brand
Get your Bosch boiler back up and running
Licensed, Red Seal–certified gas technicians across Greater Vancouver. Upfront pricing, same-day service available.