AERCO KC1000 Heater 2002 - Manual (Page 65)

TROUBLESHOOTING
7-3
KC1000 WATER HEATER TROUBLESHOOTING TABLE – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
DELAYED
INTERLOCK OPEN
1. Delayed Interlock Jumper not
installed or removed.
2. Device proving switch hooked to
interlocks is not closed
1. Check for a jumper properly installed across the delayed
interlock terminals in the I/O box.
2. If there are 2 external wires on these terminals, check to see if
an end switch for a device such as a pump, louver, etc. is tied
these interlocks. Ensure that the device and or its end switch
are functional. (jumper may be temporarily installed to test
interlock)
DIRECT DRIVE
SIGNAL FAULT
1. Unit “Type” is improperly set up as
Boiler instead of Water Heater.
1. Check the “Unit Type” menu option in the Configuration Menu
to ensure that the Unit Type is set to Water Heater. Change
menu option if necessary.
FLAME LOSS
DURING IGN
1. Worn flame detector
2. No spark from Spark Plug
3. Defective Ignition Transformer
4. Defective Ignition/Stepper (IGST)
Board
5. Defective SSOV
6. Defective Differential Pressure
Regulator
7. Carbon or other debris on Burner
1. Remove and inspect the flame detector for signs of wear.
Replace if necessary.
2. Close the internal gas valve in the boiler. Install and arc a spark
ignitor outside the unit.
3. If there is no spark, check for 120VAC at the primary side to the
ignition transformer during the ignition cycle.
4. If 120VAC is not present, the IGST Board in the Control Box
may be defective. Refer fault to qualified service personnel.
5. While externally arcing the spark ignitor, observe the
open/close indicator in the Safety Shut-Off Valve to ensure it is
opening. If the valve does not open, check for 120VAC at the
valves input terminals. If 120VAC is not present, the IGST
board in the Control Box may be defective. Refer fault to
qualified service personnel.
6. Check gas pressure readings using a gauge or manometer into
and out of the Air/Fuel Valve to ensure gas is getting to the
burner.
7. Remove the burner and inspect for any carbon or debris. Clean
and reinstall