BoilerFaultCodes.com

Potterton Envoy System Fault Codes

System Natural Gas 11.72-23.44 kW 1994-2001 Discontinued
GC Numbers: 41-590-1441-590-1541-590-1641-590-1741-590-18

Replaced by: Promax System

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Most common fault codes

1
Your boiler's internal temperature sensors are giving conflicting readings, causing the system to stop working for safety.
Gas Safe engineer required · £120-£200
2
Your boiler has detected that a sensor used to monitor water movement has moved out of place or was installed incorrectly, causing the system to stop working for safety.
Gas Safe engineer required · £90-180
3
Your boiler has sensed that the internal temperature inside the casing is getting too hot and has shut down for safety.
Gas Safe engineer required · £120-300

All 23 fault codes

Code Severity Plain English
0 Low Your boiler is simply indicating that power has been restored and it is starting up as normal.
1 High Your boiler's internal temperature sensors are giving conflicting readings, causing the system to stop working for safety.
2 High Your boiler has detected that a sensor used to monitor water movement has moved out of place or was installed incorrectly, causing the system to stop working for safety.
3 High Your boiler has sensed that the internal temperature inside the casing is getting too hot and has shut down for safety.
4 High Your boiler has tried to start up but detected that there is no water inside the system to heat safely.
5 High Your boiler has stopped working because it cannot correctly monitor the temperature of the water flowing through the system.
6 High Your boiler has stopped working because it cannot accurately measure the temperature of the water returning from your radiators.
7 High Your boiler has detected that a safety sensor monitoring the internal temperature of the casing has stopped working properly.
8 High Your boiler's safety sensor has detected a problem with its electrical circuit, meaning it cannot confirm if there is enough water in the system to operate safely.
8 (Flashing) High Your boiler has shut itself down for safety because a fault was detected, and it will not attempt to restart until it is manually reset.
9 High Your boiler has detected that the internal fan, which safely pushes exhaust fumes outside, is not spinning at the correct speed.
A High Your boiler has detected trapped air inside the system which is preventing the water from circulating properly and causing it to overheat and shut down.
B High Your boiler started correctly but the flame went out unexpectedly, causing the system to stop working for safety.
C Low Your boiler has detected very cold temperatures and has automatically turned itself on to prevent the internal pipes from freezing.
d Low Your boiler is taking a short rest to prevent it from switching on and off too quickly, which helps protect the internal parts from wear and tear.
Display not illuminated High Your boiler has no power going to it at all, meaning the screen is blank and it won't respond to any commands.
F High Your boiler has stopped working and locked itself out because it tried to start but failed to light the flame.
F (Flashing) High Your boiler has stopped working completely and entered a safety lockout mode to prevent further issues.
H Low Your boiler is not broken; it is simply in 'Holiday' mode, which keeps the system turned off except for frost protection.
L Low Your boiler is working normally but the temperature control is currently set to a very low heat setting.
o Low Your boiler has detected very cold weather and has finished running its automatic cycle to prevent the pipes from freezing.
P Low Your boiler has successfully turned off the burner and is simply circulating water to cool itself down correctly after a period of operation.
u Low Your boiler has reached the required temperature and is currently pausing its firing cycle because your home is already warm enough.

Potterton Envoy System is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

UK's #1 online installer
Boxt
Fixed-price online quotes. Next-day installation.
Get a free quote →
Heatable
Instant online boiler quotes from £1,499.
Get a free quote →
iHeat
Fast installation. Price match guarantee.
Get a free quote →

Affiliate links — we may earn a commission at no extra cost to you.