AERCO KC1000 Heater Mar 2011 - Manual (Page 67)

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
8. Staged ignition ball valve
closed.
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.
8. Open ¼” ball valve downstream of SSOV.