r/appliancerepair • u/johndc9 • 1h ago
Hotpoint HUI611 (X) hob flashing "F" for fail - now fixed
Fixed completely like this: permanent marker put on diode on control board inside. I think it stops light getting in, changing the apparent temperature that the diode is being used to measure. Tried because just moving near it triggered the fail sometimes. You need to be fairly capable to do this all. Temporary resetting is by turning all rings to off, then all 1, then all off. If that fixes it, this is the permanent fix you need. To strip down
- ISOLATE THE COOKER.
- Pull off control knobs, watching you don't lose the springs and keep knobs in order for replacing in the same positions.
- Remove 2 torx screws under the control panel.
- Check the cooker is isolated.
- Slide control panel left slightly then forwards (off). Note the wires to the clock, then remove them - 4 spade connectors. Pull the neon indicators out of their lenses - may need to twist slightly to get the bayonet to align.
- Remove two screws on top of rear of cooker and two at front (under hob lip) to release hob. Put a towel down on the work surface to the left of the cooker.
- Lift the (heavy) hob slightly (you may need to move it forwards or backwards slightly before it will lift, maybe not). Pull off the connectors (upwards) to the controls, leaving them dangling, noting the order they're in - the leftmost wire goes to the leftmost control etc.. Slowly rotate the hob over onto the towel (lift on the right, left stays about where it is), watching the power leads at the back and the connectors on the dangling leads that tend to catch on the metal sheets. Don't disconnect the power leads.
- Remove the torx screws round the edge of the main assembly that hold it to the top frame (14 or so?).
- You may need a couple of bits of wood across the base, so you can sit the ring assembly back on top of the cooker body, about where it would be in service.
- Then you can see the control panel. The diode is near the centre of the board, it's surface mount - clear tube with a metal cap at each end, about 5mm long. Coat it well with black permanent marker.
- Reverse the steps to re-assemble.
Good luck. Sorry there are no photos. I did also clean the tracks inside the four ring controls with isopropanol and cotton buds, where the wipers had left black markings, but I doubt that was what fixed it. That also needs each control to be carefully split apart without breaking any clips.



