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Release R.1.3 UK 79
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
F09 (lock out error)
Water temperature
protection.
Temperature at the top
of the tank exceeds
93°C.
1. Check that the circulation pump (if present) is working.
2. Check the position of the temperature sensor T
1
.
3. Reset the water heater controller.
n Remark
Error “F09” remains active in the event that the water
temperature during a reset was higher than 78
o
C. If this is the
case, first draw water off by opening the nearest hot water tap,
so that cold water can flow in.
If the error cannot be resolved or is persistent, contact your
installer.
F10 (lock out error)
Restriction on number
of ignition attempts
based on pressure
switch state changes.
Pressure switch not
closing.
1. Check the running speed of the fan. See ’8.7.4 Displaying
appliance specifications’.
2. Check that the hoses on the pressure switch and the air supply
hose between fan and burner are correctly fitted. Refit these if
necessary.
3. Check for cracks in the hoses on the pressure switch and the
air supply hose between fan and burner. If necessary, replace
the hoses.
4. Check whether the flue gas discharge is compliant with
Table 3.8.
5. Check for blockage in the flue gas discharge. Remove any
blockage that may be present.
6. Check for blockage in the condensation water discharge.
Remove any blockage that may be present.
7. Measure the pressure differential across the pressure switch.
Table 12.1. If there is insufficient pressure differential, clean the
heat exchanger. If the pressure differential is acceptable, check
that the pressure switch is closing, using a multimeter.
8.
If the error cannot be resolved or is persistent, contact your
installer.
To replace the necessary parts, you must contact your installer.
Table 10.2 Displayed errors (Sheet 7 of 10)
Code + Description Possible cause Solution Remark