Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 7 – TROUBLESHOOTING GUIDE
OMM-0078_0M
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
99
of
216
GF-128
Phone: 800-526-0288
09/11/2015
TABLE 7-1. WATER HEATER TROUBLESHOOTING
FAULT
INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
AIRFLOW FAULT
DURING IGNITION
1.
Blower stopped running due to thermal
or current overload
2.
Blocked
Blower Inlet
or inlet ductwork
3.
Blocked
Blower Proof
switch
4.
Blocked
Blocked-Air Inlet
switch
5.
Defective
Blower Proof
switch
6.
Defective
Blocked-Air Inlet
switch
7.
Loose temperature to AUX connection in
I/O Box
8.
Defective temperature sensor
9.
Loose wire connection between the 0-
10V signal from I/O box to the Blower
Motor input
10.
Defective I/O box
11.
Wrong 0-10V output selection on the
control box
12.
Defective Air-Fuel Valve potentiometer
1.
Check combustion blower for signs of excessive heat or high
current drain that may trip thermal or current overload devices.
2.
Inspect the inlet to the combustion blower including any
ductwork leading up to the combustion blower for signs of
blockage.
3.
Remove the
Blower Proof
switch and inspect for signs of
blockage, clean or replace as necessary.
4.
Remove the
Blocked-Air Inlet
switch and inspect for signs of
blockage, clean or replace as necessary.
5.
Measure the
Blower Proof
switch for continuity with the
combustion blower running. If there is an erratic resistance
reading or the resistance reading is greater than zero ohms,
replace the switch.
6.
Measure the
Blocked-Air Inlet
switch for continuity with the
combustion blower running. If there is an erratic resistance
reading or the resistance reading is greater than zero ohms,
replace the switch.
7.
Check the actual inlet air temperature and measure voltage at
AUX input in the I/O Box. Verify that the voltage conforms to the
values shown in the tabular listing provided in Appendix C.
8.
Refer to CORRECTIVE ACTION 7 and verify that the voltage
conforms to the values shown in Appendix C.
9.
Check wire connection from I/O Box 0-10V signal to the Blower
Motor.
10.
Measure voltage at the I/O box 0-10V output. A voltage of 8.2V
equates to a 100% open valve position.
11.
Check the
Analog Out
option on the C-More Configuration
Menu.
Valve Position
0-10V
should be selected.
12.
Check Air/Fuel Valve position at 0%, 50% and 100% open
positions. The positions on the VALVE POSITION bargraph
should match the dial readings on the Air/Fuel Valve dial.
