28
Fault Code Chart
Heater Operation
Error Code
Description of Error
Diagnostic Instruction & Correct Action & Repair
1
High Voltage
Check supply voltage
2
Low Voltage
Check supply voltage
3
Fuel Pump
Open Circuit
Check fuel pump wiring connections
Check resistance across fuel pump terminal
4
Fuel Pump
Short Circuit
Check fuel pump wiring connections
Check resistance across fuel pump terminals
5
Glow Pin
Open Circuit
Check glow pin connectors
Check resistance across glow pin
6
Glow Pin
Short Circuit
Check glow pin connectors
Check resistance across glow pin
7
Blower Motor
Open Circuit
Check blower motor wiring
Check blower motor for free rotation
8
Blower Motor
Short Circuit
Check blower motor wiring
Check connection to blower
Check for damage inside blower
9
Flame
Extinguished
Check fuel flow
Check combustion air flow
10
Failed Ignition
Check Voltage Supply
Check fuel flow
11
Over Temperature
Check coolant flow
Check water pump operation
12
Inlet Sensor
Open Circuit
Check sensor connections
Check resistance across sensor
13
Inlet Sensor
Short Circuit
Check sensor connections
Check resistance across sensor
14
Not Applicable
15
Water Pump
Open Circuit
Check water pump wiring
Check resistance of pump
16
Water Pump
Unload
Check water pump wiring
Check resistance of pump
17
Water Pump
Short Circuit
Check water pump wiring
Check resistance of pump
18
Outlet Sensor
Open Circuit
Check sensor wiring
Check resistance of sensor
19
Outlet Sensor
Short Circuit
Check sensor wiring
Check resistance of sensor
20
Flame Sensor
Open Circuit
Check sensor wiring
Check resistance of sensor
21
Flame Sensor
Short Circuit
Check sensor wiring
Check resistance of sensor