Glow-worm Ultracom 24cxi Installation And Servicing page 38

Fault
Description
codes
F26 Fault in gas valve motor.
F27 Flame detection fault.
F28 Ignition fault
F29
F32 Incorrect air pressure
F49 EBUS voltage fault
F61
F62
F63
Fault in the main board
F64
F65
F67
F68
User interface incompatible with the main
F70
board
F71 Flow heating temperature sensor fault
Permanent temperature difference between
F72
F73 Heating circuit pressure sensor fault
F74 Heating circuit pressure sensor fault
F76 Thermal fuse fault
F77 Fault in gas valve motor.
No water in the installation : the temperature
F83
does not increase when the burner is lit
Permanent temperature difference between
F84
F85 Flow and return heating sensors fault
F86
Err User interface fault
0020085231_02 - 05/10 - Glow-worm
Cause
Disconnected or defective cables
control / Defective igniter unit
Incorrect fan speed.
Fault in EBUS line
Short circuit in EBUS connector
Gas valve command fault
Gas valve closure fault
Fault in the main board memory
heating sensor.
Excessive main board temperature
Flame signal fault in the main board
control / Defective igniter unit
Incorrect product code
Flow heating temperature sensor
unclipped or defective (no
temperature variation)
heating temperatures (permanent
difference)
The sensor is shorted or disconnected.
Fault in pressure sensor
Thermal fuse disconnected
Defective thermal fuse
Defective gas valve.
Defective condensate pump (option)
Return water valve closed
Pump disconnected
Leak in the installation
return heating temperature sensors
Defective temperature sensors
Flow and return heating temperature
sensor connected to same tube
Floor heating contact open
Sensor disconnected or defective
Defective user interface
MAINTENANCE
Solution
the CO setting.
2
correctly.
the CO setting.
2
matches the product code of the nameplate (in the
event of a fault and the appliance DSN does not
appear, consult menu.d.93 reserved for the code).
connections.
board and the shunt is removed.
PCB.
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