Potterton [Red light flashing]what it means

The heat-only Pottertons of 2016 onwards — Assure Heat, Titanium Heat and Ultra Heat — have a control panel with a temperature knob and two illuminated buttons, and no screen. Faults are shown on the "chimney sweep" button, whose colour and flash count the installation manual explains: orange flashes at every heating demand show the output and are normal; green flashes are "error or auto reset conditions" where "the boiler will try to re-start several times, and normal operation will resume once the blocking condition has been eliminated"; red flashes are "lock-out conditions" that stay until reset. The red table is six rows.

One flash: sensor error — flow or return sensor connection or fault, low or no flow, reverse flow. Two: high temperature protection — the over-temperature thermostat on the heat exchanger, no water flow, or a flue fault. Three: ignition fault — no ignition, no flame after ignition, false flame, or repeated loss of flame. Four: fan fault. Five: parameter fault. Six: miscellaneous — wiring, parameter or communication error, with "check condensate drain for blockage" among the remedies.

The reset is in the same manual: "press and hold the reset button until the fault indication flashes rapidly and goes out", and "a lock-out condition can be re-set up to 5 times within one hour using the reset button" — after which the boiler must be powered off and on. The Ultra Heat user guide gives the owner a time, "Press the RESET button for a minimum of 5 seconds", and adds that a continuous red light, rather than a flashing one, means contact your installer or Baxi Customer Support. The green table has its own six meanings, described on the Potterton hub page; three green flashes, flame loss, is the one an owner meets most, and its remedy is to check the gas is on and the prepayment meter has credit.

1. 1

   Count the red flashes between pauses and write the number down. If the light is red and steady rather than flashing, skip to step 4.

2. 2

   For three flashes, check the gas is on at another appliance and the meter has credit. In frost, check any external condensate pipe and thaw it with warm water. For two flashes, check the pressure gauge reads between 1 and 2 bar and the radiator valves are open.

3. 3

   Press and hold Reset until the flashing speeds up and the light goes out — at least five seconds. The boiler allows five resets in an hour; if you reach that, switch off at the spur, wait, switch on and press Reset again.

   A red flash that returns after one reset should not be reset repeatedly. Two and three flashes can both be flue faults, and the manual says any repeating fault must be investigated by a Gas Safe registered engineer.
4. 4

   Contact your installer or Baxi Customer Support with the flash count. A steady red light means the same.