Problem
Probable Cause
Solutions
No Power – controller
dead – no backlight on
LCD
No power supply from
distribution board
Fuse failed
PCB damaged
Check 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 wrong
Check connection, try reversing
connector direction
Controller Frozen –
does not operate
normally
CPU or oscillator damaged
Replace CPU, if no success
replace PCB
Switch input appears
not to function
Not connected
Cable damaged
Float switch not
constrained properly
Float faulty
Check connection to control
panel
Test continuity, replace if
necessary
Tie float in tank such that it
switches up/down around
switch point
Replace
Tank level sensor does
not function
Not connected
Connected wrongly
Sensor faulty
Input circuit faulty
Check wiring to controller
Check wiring polarity and
correct if needed
Test with loop calibrator,
replace sensor if necessary
Test with loop calibrator,
replace PCB if necessary
Tank Level sensor
reads incorrectly
Cable vent tube blocked or
sealed
Ensure vented section of cable
terminates to atmospheric
pressure
TC Series Controller v1.30
www.3ptechik.co.uk
09-August-2017
Page 8 of 28
