E93.1001EN.C Manual CD
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Display message
F11
F a n
s p e e d
i n c o r r e c t
p u m p
o n
9 9 9 , 5
h r s
Reason
Actual fan speed differs from the unit rpm set point.
Cause:
An incorrect fan speed is detected.
Corrective action:
Check the 4 wired wiring and connections at the fan and at the main control board.
Check the 3 wired power supply wiring and connections at both ends.
Replace the fan.
Replace the main control board.
Display message
F9
F l a m e
l o s t
p u m p
o n
9 9 9 , 5
h r s
Reason
Flame signal lost during operation.
Cause:
Bad gas supply pressure.
Corrective action:
Be aware that the specified gas pressure must be met during all operation conditions.
Check if all gas valves in the supply line are completely open.
Check if the dirt filters mesh in the gas valve inlet is clean.
Check if the external dirt filter in the gas supply line is not blocked.
Check if an external gas pressure regulator is selected/installed correctly.
Check the gas pressure that is supplied to the building > call the supplier if necessary.
Cause:
Bad gas valve or gas valve settings.
Corrective action:
Check and set gas valve settings.
Cause:
Bad electrode, electrode wiring/connection (bad ionisation signal).
Corrective action:
Check ionisation signal.
Check the ignitor/ignition electrode and replace/clean if necessary.
Check the state of the ceramic insulator.
Check the distance between the electrode pin, earth pin and burner.
Check the state of the ignition wire (is also ionisation wire), and replace if necessary
Check the state of the ignitor earth wire/connection and replace if necessary.
Check for proper electrical grounding of unit.
Cause:
Bad flue gas and/or air supply system.
Corrective action:
Check if the design of the flue gas and air supply system complies with the max. com-
bined resistance as specified.
Check if the flue gas and air supply system is installed according a good installation prac-
tice by a skilled installer.
Check all seals in the flue gas and air supply system.
Cause:
External factors.
Corrective action:
Check if there were extreme weather/wind conditions when the fault occurred.
Check if the water heater room pressure is equal to the pressure at the position of the flue
gas outlet (when combustion air is drawn from the water heater room).
