Nilfisk-Advance Hydro-Retriever 2800 BR700, Service Manual

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44 - FORM NO. 56043055 / HR 2800, HR 2800C / BR 700, BR 700C
ELECTRICAL SYSTEM
Err18 Squeegee actuator overload Check for binding of squeegee lift linkage and exces-
sive weight on squeegee. Repair
Err19 Squeegee actuator severe overload Check for binding or frozen squeegee lift linkage and
excessive weight on squeegee. 2. Check for short
circuit in wiring or actuator motor. Repair or replace.
Err20 Squeegee actuator circuit open (**) Check for disconnected actuator wiring, open in wiring
or defective actuator motor, Repair or replace.
Err24 Vacuum motor overload 1. Check for debris in vac motor 2. Worn carbon
brushes 3. Defective motor bearings. Repair or re-
place.
Err25 Vacuum motor severe overload Check for short circuit in vac motor or wiring.
Err26 Vacuum motor circuit open (**) Check for disconnected vacuum motor wiring, open in
wiring or defective vacuum motor. Repair or replace.
Err27 Vacuum solenoid contacts shorted Check solenoid for welded contacts (continuity test). If
welded replace solenoid.
Err29 Vacuum solenoid coil overload 1. Check diode for continuity in one direction only, if
not, replace diode. 2. Check for proper installation of
diode (silver band is wired to positive side of coil) 3.
Check for correct wiring. 4. Check coil resistance if
below 41 ohms replace solenoid.
Err30 Vacuum solenoid coil severe overload 1. Same as error code 29. 2. Check for a short circuit
in wiring or solenoid coil. Repair or replace.
Err31 Vacuum solenoid coil open (**) 1. Check for open in coil wiring. 2. If wiring checks OK,
replace solenoid.
Err32 Solution solenoid overload 1. Check for a wiring problem. 2. Check coil resistance
if below 50 ohms replace solenoid.
Err33 Solution solenoid severe overload Check for a short circuit in wiring or solenoid valve.
Repair or replace.
Err34 Solution solenoid open (**) Check for disconnected solenoid wiring plug, open in
wiring or defective solenoid. Repair or replace.
Err35 External wiring fault Identify the 4 wire pin connector on the control
(power input to controller) board (2 Red/Brn, 1 Blk, 1 Wht/Brn). Check the 2 Red/
Brn wires for 24 volts input to the connector. Repair
Err36 No accessory output voltage (compon- Identify the same 4 wire pin connector called out in
ents affected brush, vacuum, headlight, Err35. Check the Wht/Brn wire for 24 volts (output) and
beacon and horn) all component load connections down line. Repair
MAIN CONTROLLER ERROR CODES (CONTINUED)
Error Code Fault Description Troubleshooting Action
revised 2/05