Watts Aerco Innovation 800 User Manual page 94

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