Webasto BCT010300C Repair Manual download pdf (Page 18)

Troubleshooting – BlueCool Truck Electrical System

Webasto Product N.A., Inc. 16 www.techwebasto.com

™

Table 6. Symptom:

System begins operation after 1/2 hour delay period expires. Condenser fan DOES respond but refrigerant

compressor DOES NOT respond.

Symptom/Malfunction Inspection Remedy

Power inverter switched off Switch power inverter on.

Note: Green LED indicator will only illuminate

during an active system charge cycle.

Power inverter switching relay

not responding.

Check for power on pin-86 (blue wire) and ground on pin-85

(brown wire) of relay socket X11.

Refer to Fig. 22, on pg. 20.

Check for continuity across pin-87 and pin-30 of relay socket

X11.

Note: Power inverter switch must be in the OFF position and

the charging mode active in order to perform this check.

If no reading, repair open circuit, terminals or

damaged wiring between relay socket X10 and

X11.

If open circuit (OL), replace relay.

Power inverter on, green LED

on, no 110 volt AC output.

Check AC output at 110 Volt AC connector. Refer to Fig. 26,

on pg. 22.

If no output, replace inverter (internal fault).

Power inverter on, green LED

off, no 110 volt AC output.

Perform function test on switching relay. If relay is functioning normally, replace inverter

(internal fault).

110 volt AC wiring harness

contacts or open circuit.

Switch OFF power inverter. Check physical condition of 110 V

AC harness for loose/corroded connections and open circuits.

Repair as necessary.

Compressor overheat/

overload limiter defect

Switch OFF power inverter. Remove protection cap from top

of compressor and check wiring connections.

Perform continuity test across limiter terminals. Refer to Fig.

34, on pg. 34.

Check compressor function and electrical diagnosis. Refer to

Section 6 “Troubleshooting – Refrigerant Compressor”

Repair as necessary.

If open circuit (OL), replace limiter.

Repair or replace as defined in Section 6

“Troubleshooting – Refrigerant Compressor”

Table 7. Symptom:

System begins operation after 1/2 hour delay period expires but shuts down shortly after without

completing a full charge cycle.

Symptom/Malfunction Inspection Remedy

Power inverter switches off

during charging cycle

Low battery voltage.

Check all control circuit connections for loose terminals. Refer

to Table 5 on pg 15 and Table 6 on pg 16 for check points.

Clean battery posts, cables and frame ground connections

Load-test batteries.

Check power inverter battery cables and connections for

looseness or corrosion. Check voltage drop between batteries

and inverter.

Ensure inverter battery cables are installed as recommended in

the BlueCool Installation manual P/N BCT010031B

Charge batteries.

Repair or replace as necessary.

If voltage drop is greater than 0.5 volts, repair or

replace as necessary.

Correct cable connections as recommended by

Webasto.

If inverter continues to fault out, call Webasto

Product N.A., Inc. at 1-800-555-4518

Compressor overheat/

overload limiter responds

Check refrigerant pressures. Possible over-charge or blockage.

Check operation of condenser fan. Refer to Fig. 27, on pg.

22.

Check compressor function and electrical diagnosis. Refer to

Section 6 “Troubleshooting – Refrigerant Compressor”

Switch system off and allow compressor to cool.

(Cooling may take up to 1 hour before limiter will

self-reset). Service/repair refrigerant system and

recharge to specifications.

Repair or replace defective component.

Repair or replace as defined in Section 6

“Troubleshooting – Refrigerant Compressor”

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Webasto BCT010300C Repair Manual Page 18

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