10 Water Level Control
Mk8 MM Manual Page | 201
10.11 Faults
The table below show the faults which are directly related to the water level control function.
Cap Probe 1 Communications Fault
No comms with capacitance probe 1
• Check wiring and screen on terminals 1P+, 1P-, 1T+ and 1T-
Cap Probe 2 Communications Fault
No comms with capacitance probe 2
Check wiring and screen on terminals 2P+, 2P-, 2T+ and 2T-
Cap Probe 1 Short Circuit
Hz reading is below 10kHz
• Check water level Hz reading
• Check wiring on terminals 1P+, 1P-, 1T+ and 1T-
Cap Probe 2 Short Circuit
Hz reading is below 10kHz
• Check water level Hz reading
• Check wiring on terminals 2P+, 2P-, 2T+ and 2T-
Cap Probe 1 Temp Compensation
Error
Temperature corrected probe reference is
not as expected
• Re-commission capacitance probes at temperature
Cap Probe 2 Temp Compensation
Error
Temperature corrected probe reference is
not as expected
• Re-commission capacitance probes at temperature
Cap Probe 1 Still Water Detected
Wave signature high to low peak distance
is less than still water threshold
• Check still water threshold in expansion option 28
• Check capacitance probe 1 reading history
Cap Probe 2 Still Water Detected
Wave signature high to low peak distance
is less than still water threshold
• Check still water threshold in expansion option 28
• Check capacitance probe 2 reading history
Cap Probe 1 Serial Number
Mismatch
Probe serial number detected is not the
commissioned probe serial number
• If changing capacitance probe 1, re-commission is required
Cap Probe 2 Serial Number
Mismatch
Probe serial number detected is not the
commissioned probe serial number
• If changing capacitance probe 2, re-commission is required
Cap Probe 1 Detected But Not
Optioned
Probe connected but not optioned
• Check expansion options 1 and 3
• Check wiring on terminals 1P+, 1P-, 1T+ and 1T-
Cap Probe 2 Detected But Not
Optioned
Probe connected but not optioned
• Check expansion options 1 and 3
• Check wiring on terminals 2P+, 2P-, 2T+ and 2T-
External Level Sensor Input Low
3mA or lower received from 4-20mA
external level sensor
•
Check feedback from external level sensor
• Check wiring on terminals EX- and EX+
Difference between probes/sensor
readings is below mismatch threshold
• Check expansion option 27
• Check capacitance probes and sensor readings
Probe Serial Numbers are the Same
One capacitance probe detected on both
capacitance probe terminals
• If using two capacitance probes, then two individual probes must be connected
• Check wiring on terminals 1P+, 1P-, 1T+, 1T-, 2P+, 2P-, 2T+ and 2T-
High water and 1
st
or 2
nd
low auxiliary level
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