Defensor Mk5 Technical Documentation

6.7.3 Replacing unit fuses
Warning Danger of death! Before replacing the unit fuse the steam humidifier must be
switched off and secured against unintentional reconnection as described in chapter 6.3.
Take care that the electricity supply to the main contactor is disconnected (check with voltage
tester).
Warning! Electronic components are very sensitive to electrostatic discharge. To protect these
components, measures must be taken against damage from electrostatic discharge when
replacing the unit fuse (ESD protection).
The unit fuses may only be replaced by trained and qualified personnel.
Important! If the unit fuse blows this is generally due to a faulty unit component. Therefore you should
check these components before replacing the fuse (see table below).
Only use the correct type of fuse according to the following table.
Warning! It is not permitted to use repaired fuses.
Power board (F1..F3, F1...F6 or F1...F9)
Supply module (F2)
Supply module (F1)
Control board (F5)
Fuse Specification Before replacing, check
F1 on supply module 6.3 A, slow-acting Drain pump (blocked or coil faulty)
F2 on supply module 1 A, quick-acting Inlet valve (blocked or coil faulty)
F5 on control board 50mA, quick-acting Control signal
F1…F3 on power board
(Mk5 Visual/Process 5-.. and 8-..)
16 A, super quick-acting Heating elements (on short-circuit)
F1…F9 on power board
(all other models)
20 A, super quick-acting Heating elements (on short-circuit)
6.7.4 Resetting fault indication “Error”
In order to return the steam humidifier to operation after fault elimination, the steam humidifier must be
switched off for approx. 5 seconds and then switched on again.
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