AERCO KC Series Equipped with C-More Controller for Massachusetts Only - Manual (Page 66)

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