AERCO KC Series Equipped with C-More version 3.04 - Manual (Page 70)

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