Service manual

SECTION 4 - TROUBLESHOOTING
CAFFÈ MIO – OPERATION AND SERVICE Page 37 of 110
Troubleshooting
Fuses
5 Amp Fuse Blowing
► If fuse blows when machine is powered-up, check the following;
o Exhaust fan
o Front board
o Rear board
o Wiring
► If fuse blows when a “
COFFEE” is brewed, check the following;
o Coffee valve
o Coffee dispenser motor
o Brewer motor
o Inlet valve
o Wiring
► If fuse blows when a “
CHOCOLATE” is brewed, check the following;
o Whipper motor and/or transformer
o Chocolate dispenser motor
o Chocolate valve
o Inlet valve
o Wiring
15 Amp Fuse Blowing
► Verify the wiring to the high-power components of the water tank.
► Make certain all wiring terminals are pushed completely onto the tabs of the high-
power components.
► Replace any damaged or burnt wiring terminals on high-power components.
► Heater element may be damaged – replace heater element
(P/N - E310016).
► Heater relay may be defective – replace heater relay
(P/N - M018R08).
► Check the wiring inside the fuse box and on the 15 amp fuse holder
(P/N - E110114)
– repair or replace any damaged components.
Overflows
Cup Tray Overflow
► The cup tray may be full of liquid – clean and dry the catch.
► The “
HOT WATER” valve may be leaking – repair or replace the valve (P/N - M029082).
► The “
CHOCOLATE” valve may be leaking – repair or replace the valve (P/N - M029082).
► Check the brewer home position – if the piston stops below the pour spout creating
constant dripping after each cup, correct the home position by adjusting the brewer
“
HOME” switch (P/N - M019399).
► If no overflow is present, the rear board may be wet – thoroughly dry or replace the
rear board
(P/N - G410232MIO).
Water Tank Overflow
► The overflow cup may be full of liquid – clean and dry the cup.
► Equipment may have been moved, causing water to spill out of the water tank.
► Water tank may be boiling over – reduce the water temperature.
► Water level probes may require cleaning.
► Water level probes may not be pushed completely into the grommets – adjust the
probes.
► Inlet valve may be leaking – replace the inlet valve
(P/N - E310309).