Fault Message Description
154 2
nd
Low Probes/sensor detect water level below 2
nd
low
Alarm
Check water level reading
2
nd
low alarm requires manual reset
155 Shunt Switch Time Expired Once shunt switch time expires, system goes to normally
running
Warning
If water drops after shunt switch time expires, system will generate 1
st
or 2
nd
low as relevant
200 Top Blowdown Sensor
Communications Fault
No comms with the top blowdown sensor
Warning
Check wiring and screen on terminals 3P+, 3P-, 3T+ and 3T-
201 Top Blowdown Servo Position
Error
Servomotor is outside of the commissioned range
Warning
Check wiring on terminals P-, TW, P+ and TBI, TBD
Check signal cable form the MM to the servomotor is screened at one end
Check that the servomotor is zeroed correctly
202 Top Blowdown Servo
Movement Error
Servomotor moves when not expected and vice versa
Warning
Check wiring on terminals TBI and TBD
Check servomotor drives in correct direction
Check top blowdown valve is not stuck
250 Top Blowdown Reading High TDS value detected too high
Warning
Check expansion option 46 and TDS value
300 Bottom Blowdown Controller
Comms
No comms with bottom blowdown controller
Warning
Check bottom blowdown controller is powered on and enabled
Check wiring and screen on terminals 5T+ and 5T-
301 Bottom Blowdown Controller
Software Fault
Internal check failed
Warning
Contact Autoflame approved local tech centre
302 Bottom Blowdown Servo
Closing Fault
No movement detected when bottom blowdown valve goes
to close
Warning
Check wiring on terminals 5T+ and 5T-
Check bottom blowdown valve is not stuck
303 Bottom Blowdown Servo
Opening Fault
No movement detected when bottom blowdown valve goes
to open
Warning
Check wiring on terminals 5T+ and 5T-
Check bottom blowdown valve is not stuck
304 Bottom Blowdown Servo
Battery Drive Fault
Battery has failed on bottom blowdown
controller
Warning
Warning
Contact Autoflame approved local tech centre
Page 53 Mk8 MM End User Guide 22.05.2017
4 Errors and Lockouts
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