International Thermal Research CO105D, Operator'S Manual

Page: 35 / 55

5.8
0
- VOLTAGE LOW OR HIGH
The battery or power supply voltage is below 10.5Vdc or above 15.5Vdc
-The burner will shut down.
-The diagnostic code,
0
will be displayed.
-The buzzer will sound for 10 seconds.
-The control board will purge the system with the combustion fan and circulating pump for two
minutes while it is checking if the voltage fault is still present.
If the voltage fault has cleared, the control board will reset the alarm and restart the burner. If the
condition has not cleared by the end of the purge period, the diagnostic code
0
will remain displayed.
The control board will continue to check the voltage every half hour until the voltage fault has cleared
and then restart the burner. To manually reset the fault, switch the service switch or the remote panel
switch OFF then ON again.
5.9
1
- OVERHEAT
The high temperature limit has been reached.
-The burner will shut down.
-The diagnostic code,
1
will be displayed.
-The buzzer will sound for 10 seconds.
-The control board will purge the system with the combustion fan and circulating pump for two
minutes while it is checking if the overheat condition exists. If the condition exists, the diagnostic code
1
will continue to be displayed.
-In order to restart the burner, first check the circulating pump, the level of the coolant, and the
movement of the coolant while the circulating pump is running. Then reset the fault after the
water has cooled down by switching the service switch or the remote panel switch OFF then ON again.
If it does not reset, check for a faulty aquastat and proper ground.
If a number
1
diagnostic code lights up and the heater is not in an overheat condition, check the
ground from the heater to the battery. The ground should be a minimum 10 gauge and connected
directly to the battery.
5.10
2
- FUSE BLOWN
One of the fuses on the control board has blown.
-The burner will shut down.
-The diagnostic code,
2
will be displayed.
-The buzzer will sound for 10 seconds.
-The control board will purge the system with the combustion fan and circulating pump for two
minutes while it is checking for a blown fuse.
If a blown fuse exists, the diagnostic code
2
will continue to be displayed.
-In order to restart the burner, replace any blown fuses with one of the proper size. Then reset the fault
by switching the service switch or the remote panel switch OFF then ON again.