16
HL-Series Tankless Heater
Installation
11/24/2015
Keltech •
215-1823 Rev. A; ECN 150023
Basic Troubleshooting
Problem
Solution
The heater does not work or works intermittently .
Flow switch works properly .
At the wires from the flow switch, ohm meter should read
Open without flow and Closed with flow .
Water flow through the heater is adequate to activate the
flow switch at 0 .5 gpm or at the low flow options of 0 .15 or
0 .25 gpm .
Heater is wired with the proper breaker and wire size .
Refer to Electrical Specifications for Heater table in
section 3 for proper requirements .
Unit is receiving voltage from all 3 phases of the power
source . A load voltage reading is also helpful .
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:
HL- Model No.
Serial No.
Turn power OFF before recording any Ohm readings.
