Installation
17
Basic Troubleshooting
Problem
Solution
The heater does not work or works intermittently.
1.
Flow switch works properly.
2.
At the wires from the flow switch, ohm meter should
read Open without flow and Closed with flow.
3.
Water flow through the heater is adequate to activate
the flow switch at 0.5 gpm (1.9 lpm) or at the low flow
options of 0.15 (0.6 lpm) or 0.25 (0.9 lpm) gpm.
4.
Heater is wired with the proper breaker and wire size.
5.
Refer to Electrical Specificaitons for Heater table in
section 3 for proper requirements.
Unit is receiving voltage from all three phases of the
power
source. A load voltage reading is also helpful.
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, contact Laars Technical Support.
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:
H Series Model No.
Serial No.
