Status
signal
Description Remedial actions by service
engineer
1 flash
green
Temperature
protection
• Maximum flow temperature
exceeded,
• Flow temperature rise rate too
high,
• Excessive difference between
flow and return temperature
• Check system circulation &
pump operation
• Check demands for boiler
operation (switched live operation)
• Check temperature setting
• Check temperature sensors in boiler
2 flashes
green
Shutdown input
• BL terminals on User Interaction
Controller are open circuit
•If condensate pump is wired
to these terminals check
operation of condensate pump
• Check wiring to BL terminals
(link present or connections to
external device correct)
3 flashes
green
Flame loss
• No flame detected during
operation
• Check gas supply is turned on
and gas is available if on a
pre-payment meter
• Check flue condition
4 flashes
green
Communication
fault
• Bad connection or wiring fault
• Internal communication fault
•Check wiring/connections
between boiler and User Interaction
Controller and within the box
• If necessary replace control/fan assy
5 flashes
green
Parameter fault
• Parameter error or faulty PU
• Configuration error or PCB fault
• Replace PU and recommission
• Replace control/fan assy
6 flashes
green
Miscellaneo us
• Internal fault in combustion
control unit
• Replace combustion control unit
Operation status and error codes are displayed on the “chimney
sweep” button (3) on the control panel. In normal operation this
button is illuminated and goes off for a time once periodically.
When normal operation is interrupted for some reason this
button will turn off and flash on a number of times periodically.
The colour and number of flashes displayed is dependent on
the boiler status or fault condition.
The orange LEDs will flash at EVERY heating demand.
The number of flashes will correspond with the output
of the boiler as shown in the table. e.g. 4 orange flashes
= 21kW. This is normal and does not indicate a fault
condition.
“Error” or auto reset conditions (Green flashes on
“chimney sweep”)
The following table describes the conditions that may result in a
blocking signal being displayed.
The boiler will try to re-start several times, and normal operation
will resume once the blocking condition has been eliminated.
Should the conditions persist the boiler may go into lock-out
(see following section)
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