When running the hot water, the temperature raises to 50 degrees then it stops burning, the water goes cold then it fires up again and goes to 50 degrees then does the same thing over and over again. Any ideas on what the problem is?

Daz, January 2010

Sorted, fixed the problem with the engineers solution on here, just what Tim P said :-)
No more hot and cold showers, an it took about 10 minutes top, Very Pleased

Adie B, November 2011

no hot waer or heating just flashes f- 37eco

kim, September 2011

secondary heater exchanger pipe removal to add new clips.

mike, June 2011

ferrolli engineer above is spot on. My F24B was doing the same thing. For some reason the problem was more pronounced with the shower than the hot taps. Disconnect the two pink wires from the CH sensor, pull them back through the sleeving, unclip the CH sensor from the top position and clip it back on to the pipe lower down after the bend such that the wire connectors from the sensor are not fouled by the cover. Reconnect the wires to the sensor and tuck the excess wire back into the bottom of the sleeving. Job done!

Tim P, February 2011

We have the same problem with our ferroli F30 which cycles between hot and cold. We have had this before and it turned out to be a hairline crack in a tiny plastic pipe that is part of the boiler. Last time our plumber identified the problem by contacting ferroli but when he removed the part to check for the crack it worsened it and the bolier would not work at all after that until the part was replaced so beware.

A ferroli user, January 2010

move the small ch sensor on the heatexchanger top left hand side about 8 inches down .common problem ,the sensor gets too hot in its factory position .turn off power to do this it will cure it

ferrolli engineer, January 2010