Troubleshooting; To Troubleshoot The Heating Element In The Front Handle; To Troubleshoot The Heating Element In The Rear Handle; To Troubleshoot The Generator - Husqvarna 545 Mark II Workshop Manual

9.1 Troubleshooting

You can do the troubleshooting procedure with most
components attached to the product. Tools necessary
for the troubleshooting procedure is:
• Ammeter
• Ohmmeter
• Cooling spray
The most common fault is oxidisation of the heating
element contacts in the rear handle and the switch
contact.
G
H
B
D
9.2 To troubleshoot the heating element in the
front handle
1. Measure the resistance between point (E) and (F).
The resistance for heating element must be 3.0-4.0
Ω.
2. Replace the front handle if the resistance is less
than 3.0 Ω or more than 4,0 Ω.
9.3 To troubleshoot the heating element in the
rear handle
1. Disconnect the cable connection at (B1) and (D1).
2. Clean the contacts (B1) and (D1).
70 - Troubleshooting
9 Troubleshooting
A
C
E
C1
A1
B1
D1
3. Measure the resistance between point (B1) and
(D1). The resistance for heating element must be
0,8-1,0 Ω.
4. Replace the heating element if the resistance is less
than 0.8 Ω or more than 1,0 Ω.

9.4 To troubleshoot the generator

1. Measure the resistance in the generator between
point (A1) and (G). The resistance for generator
must be 0.5 Ω.
2. Replace the generator if the resistance is more than
0.5 Ω.

9.5 To troubleshoot the start/stop switch

1. Disconnect one of the wires to the switch and
connect the ohmmeter between the points (A1) and
(F).
2. The ohmmeter must show more than 1000 Ω with
F the start/stop switch in the OFF position. Replace
the start/stop switch if the resistance is less than
1000 Ω.
3. The ohmmeter must show more than 0.1 Ω with the
start/stop switch in the ON position. Replace the
start/stop switch if the resistance is less than 0.1 Ω.
9.6 To troubleshoot the heating element and
thermostat
1. Disconnect the earth cable (H).
2. Measure with the ohmmeter between (H) and (C1).
3. The ohmmeter must show 0.0 Ω at an air
temperature of 15 C° or more. Replace the heating
element and thermostat if the resistance is less or
more than 0.0 Ω.
Note: You must replace the heating element and
thermostat at the same time.
4. Cool the thermostat with a cooling spray. The
ohmmeter must show 8.0 Ω. Replace the heating
element and thermostat if the resistance is less or
more than 8.0 Ω.
Note: You must replace the heating element and
thermostat at the same time.
722 - 003 - 26.03.2019