Troubleshooting
Refer to the Safety instructions. No electrical works should be carried out other than by an appropriately
qualified Electrician. Permits to work may be required at local site conditions. If in any doubt, consult your
system supplier.
Problem
Probable Cause
Solutions
No Power – controller
dead – no backlight
on LCD
No power supply from
distribution board
Fuse failed
PCB damaged
Check 220-240 vac 50hz supply
at power input terminals.
Check Fuse F1
Replace PCB, contact
manufacturer.
Backlight on – no
display – no
operation
CPU chip missing
CPU chip badly inserted or
bent pins
CPU chip wrong way round
CPU chip faulty
PCB damaged
Insert CPU
Insert CPU correctly or replace
if necessary
Remove and re-insert correctly
Replace CPU
Replace PCB, contact
manufacturer.
Controller Frozen –
operates normally
but keypad
unresponsive
Keypad not connected or
connected wrongly
Check connection
Controller Frozen –
does not operate
normally
CPU or oscillator damaged
Replace CPU, if no success
replace PCB
Tank level sensor
does not function
(error 6)
Not connected
Sensor faulty
Input circuit faulty
Check wiring to controller
Test with continuity meter,
replace sensor if necessary
Test with jumper wire, replace
PCB if necessary
Tank shows full or
overflow condition
constantly
Sensors disconnected
Incorrect sensor function or
orientation
Check wiring
Ensure sensors show closed
circuit when dry, open circuit
when immersed.
Low Alarm
Sensor disconnected
Check wiring
DTC200 V1.20 Page 13 22/01/20
