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Release R.1.3 UK 81
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
C02 (lock out error)
Error message from
the water heater
controller.
Incorrect reference
voltage from the AD
converter.
1. Reset the ThermoControl.
2. Check that the frequency of the mains power complies with
table 3.8. If this is not the case, contact your installer.
3. If the frequency is correct but the error persists, replace the
ThermoControl.
To replace the necessary parts, you must contact your installer.
Internal error message
from the water heater
controller.
EEPROM read error.
50 Hz error.
Internal
communication error
Internal error message
from the water heater
controller.
Gas valve relay error.
Safety relay error.
Ignition relay error.
RAM error.
EEPROM error.
EEPROM contents do
not match the software
version.
Processor software
error.
Table 10.2 Displayed errors (Sheet 9 of 10)
Code + Description Possible cause Solution Remark