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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 1561
Experience:  30 Years on the tools, now retired, Ex CORGI
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I have an Ideal Standard Heat Logic 24. Today I drained the

Customer Question

I have an Ideal Standard Heat Logic 24. Today I drained the whole radiator system so that I could replace 2 faulty radiator valves (as they would not shut off water supply) as I need to remove raditory. Have since replaced radiator valves, refilled system + inhibitor, and bled all air from all radiators, though I have no heat to radiators. Believe display on boiler at one point showed Fd or F5 / FS
Submitted: 1 year ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 1 year ago.

F5 is lack of circulation.

Have you vented the pump?

Customer: replied 1 year ago.
How do I vent the pump?
Expert:  Andrew Smith replied 1 year ago.

The large screw in the centre, slacken it and put a tub under to catch any water