Hardi 3500 EXPLORER, Operator'S Manual

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31
3500 / 4000 EXPLORER
Problem Probable cause Control / Solution
EC operating unit
Operating unit not
functioning
Blown fuse(s)
Check mechanical function of microswitches
Use cleaning/lubricating agent if switches do not
operate freely
Check motor (450 - 500 mA MAX)
Change motor if over
Wrong polarity Brown = positive (+) Blue = Negative (-)
Valves not closing properly Check valve seals for obstructions
Check microswitch plate position
Loosen screws holding plate a ½ turn
No power Wrong polarity
Check that Brown is (+), Blue is (-)
Check printed circuit board for dry solder joints
or loose connections
Check fuse holder is tight around fuse
Foam marker
Compressor will not
start
Poor power supply
Check battery (must be 12 V) and wiring
Use the HARDI electric distribution box
Blown fuse Change external fuse
Defective relay Open compressor box and check relay for
corrosion
No liquid to foam gen-
erator Blown fuse
Open compressor box and check fuse located
on printed circuit board
Solenoid valve not opening Check wiring at printed circuit board for corro-
sion or loose connections
Filter blocked Dismantle and clean
Foam quality inconsist-
ent
Recommendations not followed
See
Foam marker Operators Manual
Blob interval inconsist-
ent Adjustment valve gummed up
Flush system
Foam liquid in air lines Non-return valve in line gummed up
Dismantle and clean