15
Installation
CNA-Series Tankless Heater
Keltech •
215-1814 Rev. C; ECN 150010
7/13/2015
Troubleshooting for Controller
Problem
Solution
No Power
Verify power is on .
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 .
Check for loose or disconnected wires .
Check the incoming service connection . Voltage must
match name plate rated voltage . Labels are located on
the cabinet door (SCCR) and on upper left of back plate
(Serial Number Label) .