Tuttnauer 2301006, Operation & Maintenance Manual

Page: 86 / 122

Page 81 of 117 pages
11.3 Troubleshooting
Symptoms
Possible causes check-ups and
tests
Corrections
1. Control unit not
energised. No displays
and lights on the front
panel. 1.1 The control circuit breaker
switched off. 1.1 Check and switch on the
circuit breaker.
2. STS generator does
not operate. 2.1 Water pump defective or
blocked. 2.1 Repair or replace pump.
Replace motor.
2.2 Blocking or low water
pressure in the pump
circuit. 2.2 Adjust water pressure,
ensure a free circulation
of water.
2.3 Upper electrode
short-circuited. 2.3 Clean or replace upper
electrode.
2.4 Pressure switch faulty or
out of calibration. 2.4 Check, calibrate pressure
switch or replace it.
2.5 Lower electrode dirty or
rusted. 2.5 Clean or replace the
electrode.
2.6 Contactor controlling the
heat up current is
damaged. 2.6 Check the cause and
replace contactor.
2.7 Control system trouble. 2.7 Replace boards.
2.8 Solenoid or pneumatic
steam supply valve stuck
or defective. 2.8 Repair or replace
solenoid or pneumatic
valve.
2.9 Vacuum in the water pump
to STS generator. 2.9 Release the manual tap
next to the water
reservoir to release
vacuum in the water
pump to prevent air
pockets.
Steam pressure goes
beyond the control
point. 2.10 Pressure switch faulty or
incorrectly set.
2.10 Check, repair or replace
the pressure switch.
3. Steam pressure
goes beyond the
control point. 3.1 Pressure transducer faulty
or incorrectly set. 3.1 Check, repair or replace
the pressure transducer.
3.2 Contacts at contactor
welded because of short
circuit. 3.2 Check the cause, replace
the damaged contactor.