Watts Aerco Innovation 800 User Manual page 97

Innovation Hot Water Hot Water Boiler User Manual
TABLE 7-1. HOT WATER BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
HIGH WATER TEMP Faulty Water temperature switch.
1.
SWITCH OPEN
Incorrect PID settings.
2.
Faulty shell temperature sensor.
3.
Unit in MANUAL mode
4.
Unit setpoint is greater than Over
5.
Temperature switch setpoint.
System flow rate changes are
6.
occurring faster than units can
respond.
HIGH WATER See HIGH WATER TEMPERATURE
1.
TEMPERATURE SWITCH OPEN.
Temp HI Limit setting is too low.
2.
IGN BOARD Communication fault has occurred
1.
COMM FAULT between the PMC board and
Ignition/Stepper (IGST) board
IGN SWITCH CLOSED Air/Fuel Valve not rotating.
1.
DURING PURGE
Defective or shorted switch.
2.
OMM-0120_0A
GF-128-I
CHAPTER 7 – TROUBLESHOOTING GUIDE
PROBABLE CAUSES
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
CORRECTIVE ACTION
Test the temperature switch to insure it trips at its actual
1.
water temperature setting.
Check PID settings against Menu Default settings in Chapter
2.
3. If the settings have been changed, record the current
readings then reset them to the default values.
Using the resistance charts in Appendix C, measure the
3.
resistance of Shell sensor and BTU sensor at a known water
temperature.
If unit is in MANUAL mode switch to AUTO mode.
4.
Check setpoint of unit and setpoint of Temperature switch;
5.
Ensure that the temperature switch is set higher than the
unit's setpoint.
If the system is a variable flow system, monitor system flow
6.
changes to ensure that the rate of flow change is not faster
than what the units can respond to.
See HIGH WATER TEMPERATURE SWITCH OPEN.
1.
Check Temp HI Limit setting.
2.
Press CLEAR button and restart unit. If fault persists,
1.
contact qualified Service Personnel.
Start the unit. The Air/Fuel Valve should rotate to the purge
1.
(open) position. If the valve does not rotate at all or does not
rotate fully open, check the Air/Fuel Valve calibration. If
calibration is okay, the problem may be in the Air-Fuel Valve
or the Control Box. Refer to qualified service personnel.
If the Air/Fuel Valve does rotate to purge, check the Ignition
2.
switch for continuity between the N.O. and COM terminals. If
the switch shows continuity when not in contact with the cam
replace the switch.
Page 97 of 174
11/15/2016