Innovation Hot Water Hot Water Boiler User Manual
- INTERNATIONAL
CHAPTER 7 – TROUBLESHOOTING GUIDE
Page
94
of
174
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0120_0A
11/15/2016
Phone: 800-526-0288
GF-128-I
TABLE 7-1. HOT WATER BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
AIRFLOW FAULT
DURING PURGE
1.
Blower not running or running too
slow.
2.
Defective
Air Flow
switch.
3.
Blocked
Air Flow
switch.
4.
Blocked blower inlet or inlet ductwork.
5.
No voltage to switch from control box.
6.
PROBABLE CAUSES from AIRFLOW
FAULT DURING IGNITION above,
items 3 to 12, applies to this fault.
1.
Start the unit. If the blower does not run check the blower
solid state relay for input and output voltage. If the relay is
okay, check the blower.
2.
Start the unit. If the blower runs, check the airflow switch for
continuity. Replace the switch if there is no continuity.
3.
Remove the air flow switch and inspect for signs of blockage,
clean or replace as necessary.
4.
Inspect the inlet to the combustion blower including any
ductwork leading up to the combustion blower for signs of
blockage.
5.
Measure for 24 VAC during start sequence from each side of
the switch to ground. If 24VAC is not present refer to qualified
service personnel.
6.
See CORRECTIVE ACTIONS from AIRFLOW FAULT
DURING IGNITION above, items 3 to 12.
AIRFLOW FAULT
DURING RUN
1.
Blower stopped running due to thermal
or current overload.
2.
Blocked Blower inlet or inlet ductwork.
3.
Blocked airflow switch.
4.
Defective airflow switch.
5.
Combustion oscillations.
6.
PROBABLE CAUSES from AIRFLOW
FAULT DURING IGNITION above,
items 3 to 12, applies to this fault.
1.
Check combustion blower for signs of excessive heat or high
current draw 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 airflow switch and inspect for signs of blockage,
clean or replace as necessary.
4.
Measure the airflow 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.
5.
Run unit to full fire. If the unit rumbles or runs rough, perform
combustion calibration.
6.
See CORRECTIVE ACTIONS from AIRFLOW FAULT
DURING IGNITION above, items 3 to 12.
