Fault 40 Code 101 — Temperature sensor T1 faulty, short circuit

What does Fault 40 101 mean?

The Worcester Bosch Greenstar CDi Boiler displays Fault 40 with code 101, indicating a short circuit on the sensor lead for temperature sensor T1, which is on collector group 1.

• Short circuit in the sensor lead (T1)
• Faulty temperature sensor T1

Click steps to track your progress.

1. 1

   Visually inspect the sensor lead for T1 for any signs of damage to the insulation or exposed wires.

2. 2

   Ensure no metallic parts are shorting the sensor connections.

3. 3

   If a short is suspected or the fault persists, contact a qualified heating engineer to check and replace temperature sensor T1 if necessary.