COFFEtek NEVA 4, Technical Manual

Page: 34 / 40

COFFE tek LTD
NEVA 4 Issue 1 22/02/08 34
FAULT FINDING GUIDE
FAULT POSSIBLE CAUSE ACTION
FATAL I
2
C ERROR
displayed
Keypad does not bleep
Drinks cold
No motor operation
Machine inoperable;
no display
Heater tank
not filling
(a) Electrical
noise
(b)
MPU Board fault
(c) Software
error
(a) Keypad
damaged
(b) Keypad
disconnected
(c)
MPU Board fault
(a)
Heater fuse blown
(b)
Thermal cut-out tripped
(c) Desired
temperature
incorrectly set
(d)
Excessive scaling in
heater tank
(e)
Solid state relay fault
(f)
Low cut-out in program
incorrectly set
(g)
Temperature probe wet
(a) Jammed
motor
(b)
Power Supply failure
safety trip
(a)
Power Supply failure
(a)
Low water pressure
(b)
Inlet valve fault
(c)
MPU Board fault
(a) Check
motors
(b)
Replace MPU Board
(c) Reset
power
(a) Replace
keypad
(b) Reconnect
(c)
Replace MPU Board
(a)
Check and replace
(b) Reset
trip
(c) Check
desired
temperature setting
(d)
Check tank and descale if
necessary
(e) Check
relay
(f)
Reset low cut-out setting
(g)
Dry probe and check
for leaks.
(a)
Check motor operation
(b) Reset
power
(a)
Replace Power Supply
Board
(a)
Check water pressure
(b)
Check inlet valve
(c)
Replace MPU Board