Innovation Hot Water Hot Water Boiler User Manual
- INTERNATIONAL
CHAPTER 7 – TROUBLESHOOTING GUIDE
OMM-0120_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
99
of
174
GF-128-I
Phone: 800-526-0288
11/15/2016
TABLE 7-1. HOT WATER BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
LINE VOLTAGE
OUT OF PHASE
1.
Line and Neutral switched in AC
Power Box.
2.
Incorrect power supply
transformer wiring.
1.
Check hot and neutral in AC Power Box to ensure they are not
reversed.
2.
Check transformer wiring, in AC Power Box, against the power
box transformer wiring diagram to ensure it is wired correctly.
LOW GAS
PRESSURE
1.
Incorrect supply gas pressure.
2.
Defective
Low Gas Pressure
switch.
1.
Measure gas pressure upstream of the SSOV Actuator(s) with
the unit firing. Ensure it is between 4.0” W.C. (996 Pa) and 14”
W.C. (3.49 kPa) (see section 2.10.1).
2.
Measure gas pressure at the Low Gas Pressure switch. If it is
greater than 2.6” W.C. (647 Pa), measure continuity across the
switch and replace if necessary.
LOW WATER
LEVEL
1.
Insufficient water level in system.
2.
Defective water level circuitry.
3.
Defective water level probe.
1.
Check system for sufficient water level.
2.
Test water level circuitry using the Control Box front panel LOW
WATER TEST and RESET buttons. Replace water level
circuitry if it does not respond.
3.
Check continuity of probe end to the shell, change probe if there
is no continuity.
MODBUS COMM
FAULT
Unit not seeing information from
Modbus network.
Check network connections. If fault persists, contact qualified
Service Personnel.
PURGE SWITCH
CLOSED
DURING IGNITION
1.
A/F Valve rotated open to purge
and did not rotate to ignition
position.
2.
Defective or shorted switch.
1.
Start the unit. The Air/Fuel Valve should rotate to the purge
(open) position, then back to ignition position (towards closed)
during the ignition cycle. If the valve does not rotate back to the
ignition position, check the Air/Fuel Valve calibration. If
calibration is okay, the problem may be in the Air/Fuel Valve or
the Control Box. Refer fault to qualified service personnel.
2.
If the Air/Fuel Valve does rotate to the ignition position, check
the purge switch for continuity between the N.O. and COM
terminals. If the switch shows continuity when not in contact
with the cam, check to ensure that the switch is wired correctly
(correct wire numbers on the normally open terminals).
