Troubleshooting - Keltech C2N363/600D Installation Manual

Installation
Troubleshooting for Controller
Problem
No Power
Basic Troubleshooting
Problem
The heater does not work or works intermittently .
Turn power OFF before recording any Ohm readings.
If the above steps do not solve the problem, some additional checks may be performed. Follow the
schematic to perform the following continuity checks:
 High temperature bimetals (Manual Reset Safeties) .
 Optional ground fault breaker must be in the closed position for the unit to work .
 All internal breakers must be in the ON position for the unit to work .
For additional information on Troubleshooting or other information, please call Keltech Inc . technical support at
1-800-999-4320 . Please have Model No . and Serial No . available when seeking technical assistance . Serial No .
tag is located in the enclosure on the upper left hand corner of the back plate . Please record and maintain this
information at all times:
C2N Model No.
Serial No.
Bradley • 215-1821 Rev. B; ECN 16-17-005
Solution
Verify power is on .
Check incoming service connection . Voltage must match
name plate rated voltage . Labels are located on upper left
of back plate (serial number label) .
Turn power off . Check continuity of all internal fuses in
control transformer, heating elements or optional fused
disconnect circuits .
Check all field service circuit breakers or fuses .
Check the safety interlock door switch to make sure
that lack of power is not due to misadjustment or open
enclosure door .
Check system temperature limit control to make sure
it has not activated due to excessive heat exchanger
temperature or faulty sensor .
Turn power off . Check for loose or disconnected wires .
Solution
1 . Heater is wired with the proper breaker and wire size .
Refer to Electrical Specifications table in Step 3 for
proper requirements .
2 . Unit is receiving voltage from all 3 phases of the
power source . A load voltage reading is also helpful .
3 . Verify the functionality of the flow switch .
4 . At the wires from the flow switch, read "Open" without
flow and "Closed" with flow .
5 . Water flow through the heater is adequate to activate
the flow switch at 0 .75gpm/2 .8 lpm (standard) .
5/3/2016
C2N Series Tankless Heater
13