How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Andrew Smith Your Own Question
Andrew Smith
Andrew Smith, HVAC Technician
Category: HVAC
Satisfied Customers: 3647
Experience:  Heating and Controls engineer
46681511
Type Your HVAC Question Here...
Andrew Smith is online now

hi got a combi boiler glowworm 30cxi with a fault code f 11

Customer Question

hi got a combi boiler glowworm 30cxi with a fault code f 11 is there anything I can do to sort it out

Submitted: 4 years ago.
Category: HVAC
Expert:  Andrew Smith replied 4 years ago.
Is the fault code flashing with any other numbers?
Is it lighting at all?
What is the reading on the pressure gauge?
Customer: replied 4 years ago.


no other codes just f11 the light comes on but the boiler does not work try to put pressure in to it goes up to 1 bar then fault code 11 flashes on

Expert:  Andrew Smith replied 4 years ago.
F11 is an electrical connection fault on the PCB.
Are you able to turn the power off and access it, remove each connection one at a time and refit it.
Make sure they all go back on correctly and try and fire it again.
Customer: replied 4 years ago.

whats the pcb

Expert:  Andrew Smith replied 4 years ago.
The Printed Circuit Board in the main control box in the main console
Customer: replied 4 years ago.


tried that did not work

Expert:  Andrew Smith replied 4 years ago.
If you have tried all the connections then it must be a wiring fault, are you able to trace and check the other end of each wire?