ERROR
CODE
MEANING POSSIBLE CAUSE SOLUTION
A9
Valve Circuit Error
Description:
During normal operation of the MaxSys controller, the valve
circuit is regularly checked. If the check fails, Error 9 will be
set.
There is a problem with the gas
valve.
Replace the modulating gas valve
A11
Temperature sensor self test on the boiler heat
exchanger has failed
a) Water ow in the system has
reversed.
b) Temperature sensors are scaled
up.
a) If it happens at rst start up then check that the
ow and return pipes have been installed
correctly. Check the direction of the water pump.
b) Clean or replace sensors
A13 Remote Reset Inhibit
The boiler has been attempted to
reset remotely more than 5 times in
15 minutes.
Inspection by a competent person is recommended.
Reset can be achieved by switching the isolation
switch off and on.
A15
Drift Test Error
Description:
When the boiler is unable to start up due to a consistent
error described under error code E81, then the boiler is
locked out with error code A15.
See error code E81 See error code E81
A16
Stuck at Test Error on CH Supply Sensor
Description:
When temperature rise cannot be detected on the supply
sensor after successful ignition, error code A16 is set.
a) The sensor has been removed
from the pocket.
b) The sensor is faulty.
a) Insert the sensor back into place
b) Replace the sensor
A17
Stuck at Test Error on CH Supply Sensor
Description:
When temperature rise cannot be detected on the supply
sensor after successful ignition, error code A17 is set.
a) The sensor has been removed
from the pocket.
b) The sensor is faulty.
a) Insert the sensor back into place
b) Replace the sensor
A18
Cracked Sensor Test Error
Description:
When a large crack in the CH Supply or CH Return Sensor
is detected, error code A18 is set.
The Supply or Return Sensor is
cracked.
Replace the sensor
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