Glow-worm showing F75 in Tipton? The boiler did not see the pressure rise it expected when the pump started. Safe checks and next steps.
Each time a Glow-worm starts its pump, it watches for a small rise in pressure. F75 means that rise did not happen. The boiler takes that to mean the pump, the pressure sensor or the water level is not right, and stops.
Low pressure is the first thing to rule out. After that, the usual suspects are a sticking pump, a failing pressure sensor, or air in the system. Your manual will confirm the meaning for your model.
Plenty of Tipton homes have had radiators moved or added during kitchen and extension work. Air trapped after that kind of job is a common reason for F75 on the first cold week.
The boiler stopped because the water side did not check out. It is protecting itself. Smell gas? Get everyone outside, leave switches alone and call 0800 111 999, the National Gas Emergency line. A code on the display is not a leak. A smell might be.
That points to air in the system. Bleeding and topping up may fix it. If not, the pump may need help to clear an airlock.
Not always. Low pressure or air are more common. A pump or sensor is only replaced once those are ruled out.
If the pressure is low, top up using the filling loop as your manual shows. Then reset once.
Cold tops on upstairs radiators mean air. Bleed them with a radiator key, then check the gauge again and top up if it has dropped.
A pump that buzzes, knocks or stays silent is useful to mention. It helps pin down the fault.
The pump, the pressure sensor, the expansion vessel and any trapped air. On older systems, sludge can slow the pump as well.
A photo of F75 on the display and of the gauge, plus a note on any recent plumbing work. That often explains the fault on its own.
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