13
Installation
C2N Series Tankless Heater
Bradley •
215-1821 Rev. B; ECN 16-17-005
5/3/2016
Troubleshooting for Controller
Problem
Solution
No Power
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 .
Basic Troubleshooting
Problem
Solution
The heater does not work or works intermittently .
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) .
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.
Turn power OFF before recording any Ohm readings.
