Volvo VHD User Manual

Heating and Air Conditioning 179
A/C Diagnostic Module
Problem Codes
The diagnostic module has two LED lights
(one green and one red) which indicate if a
system problem has been detected. If a
problem is detected, a fault code or “blink”
code is activated to identify the condition.
The blink codes listed on the label are:
Slow Green Normal
Fast Green Low system voltage
1 Red Blink Loss of refrigerant
2 Red Blinks Overcharge, blockage or
fan failure
3 Red Blinks Open or shorted clutch
or circuit
4 Red Blinks Open pressure switch or
circuit
The air conditioning system is under
pressure. The possibility of an explosion
is possible if serviced incorrectly. A
qualified technician should perform any
service needed. Failure to follow this
may lead to an explosion causing severe
injury or death.
W3002004

Volvo VHD Specifications

General

Brand	Volvo
Model	VHD
Category	Trucks
Language	English