PREVOST H3-41 - Diagnostic Codes and Troubleshooting

TECHNICAL INFORMATION
Espar
Fuel consumption
1.75 US qts/hr
(1,65 l/hr)
Rated voltage
24 volts
Electric power consumption
55 watts
ESPAR Preheater Diagnostic Codes
Refer to Espar “Installation, Troubleshooting and
Parts Manual” inserted in the Maintenance
Manual.
Espar Preheater Diagnostic Code List
Code #
Description
000
Normal operation – no faults
002
Warning – under voltage
011
Under voltage shutdown
013
Temperature too high at the heat
exchanger
022
Short circuit in glow plug relay
024
Short circuit in voltage regulator
032/033
Blower motor is not turning
Blower speed control relay defective
035
Open in parts control relay
037
Coolant pump motor not turning
039
Short in fan motor relay
047
Short in fuel metering pump
052
No start – safety time exceeded
054
Flame out in "high" output setting
056
Flame out in middle heat
060
Open circuit in air temp. sensor
062
Open circuit, operating unit
064
Open circuit to flame sensor
090
Control box defective
001
Warning – over voltage
010
Over voltage shutdown
012
Overheat switch opened
Espar Preheater Diagnostic Code List
Code #
Description
020
Glow plug defective
023
Open circuit to voltage regulator
025
Short in diagnostic pins
034
Open circuit to water control relay
036
Short in part control relay
038
Open in fan motor relay
040
Short circuit in water control relay
051
Flame sensor defect
053
Flame out during start cycle
055
Flame out in low heat
057
Flame sensor defect – harness
061
Short circuit in air temperature
sensor
063
Short circuit, operating unit
065
Short circuit in flame sensor
091
External power supply erratic
DDEC IV DIAGNOSTIC CODES
To read the diagnostic codes, a Diagnostic Data
Reader should be plugged into the receptacle
located on the lower side panel of the L.H.
control panel. To read diagnostic codes as blink
codes, momentarily depress the STOP ENGINE
OVERRIDE switch while the ignition is ON, the
engine is idling or shut off. Active codes will be
flashed on the STOP ENGINE indicator light
followed by the inactive codes being flashed on
the CHECK ENGINE indicator light. The cycle is
repeated until the operator depresses the STOP
ENGINE OVERRIDE switch again. For
example: code "43" consists of four flashes,
followed by a short pause, then another three
flashes in quick succession. The following table
is a list of the DDEC diagnostic codes.
DDEC IV
CODE
DESCRIPTION
11 (VSG) Variable speed governor sensor input voltage low
12 (VSG) Variable speed governor sensor input voltage high
13 Coolant level sensor input voltage low
14 Oil, coolant, or intercooler, temperature sensor input voltage high
15 Oil, coolant, or intercooler, temperature sensor input voltage low
16 Coolant level sensor input voltage high
17 Bypass or throttle, valve position sensor input voltage high
18 Bypass or throttle, valve position sensor input voltage low
21 TPS input voltage high
121