13
Installation SNA-Series Tankless Heater
Keltech • 215-1815 Rev. B; ECN 130011 10/17/2014
Troubleshooting using the Flow Limit Control Board (FLCB)
Problem Solution
The heater does not work or works intermittently. Check that the flow sensor located at the inlet is spinning
with water running. Check if in Low flow (> 1.5 gpm) that
the FLCB light is on. If in High flow (> 15gpm) both the low
flow light and high flow lights will be illuminated.
Check that water flow through the heater is adequate to
activate the flow sensor at 1.5gpm.
Check that the heater is wired with the proper breaker and
wire size. Refer to Table 1 for proper requirements
Check that the unit is receiving voltage from all 3 phases
of the power source. A load voltage reading is also helpful.
Element Load Bank 1–2 or 3–4 is not energized. Check FLCB with corresponding light indicated:
Bank 1–2 on the front bezel = Bank 1 on the FLCB
Bank 3–4 on the front bezel = Bank 2 on the FLCB.
If the light is off and there is power on. Check if water
temperature is greater than 175˚F. Decrease water
temperatures and restart.
Follow the schematic to perform the following continuity checks:
Emergency stop switch.
Door guard.
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:
SNA- Model No.
Serial No.
High Temp.
Limit Senser
Input
Bank 2 Over
Temp. (OT)
Bank 1 Over
Temp. (OT)
High Flow
Status
Low Flow
Status
Purge/Dump
(SNA Models
Only)
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