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Troubleshooting
311327E 7
3. Remove the thermostat housing by removing the
two mounting screws and carefully pulling the
housing away from the heater.
4. Push in the red reset button on the switch.
5. If the Thermal Limit Switch does not feel as though it
reset, then disconnect one lead from the Thermal
Limit Switch and read continuity across the switch
with an ohmmeter. If there is no continuity, the
switch is defective and must be replaced.
6. If this does not solve the problem, replace the
thermostat.
7. Move the thermostat housing back into place and
install the two mounting screws.
8. Switch on the electrical power and monitor the
operation of the primary heater to ensure it is
functioning properly.
9. Heating Rods - The primary heater contains four
1250-watt (38.7 ohms each) heating rods wired in
parallel.
To check that all rods are operational, proceed as
follows:
a. Turn OFF all switches and lock out incoming
power at the source.
b. Remove the thermostat housing by removing
the two mounting screws and carefully pulling
the housing away from the heater.
c. Remove the heating rod wire nuts. Separate the
heating rod leads from the wire harness and
read the resistance across the four heating rods
with an ohmmeter. The combined resistance
should be 9.6 ohms. A higher resistance
indicates that at least one of the rods is not
working. If this is the case, proceed to Step d.
d. Disconnect the heating rods and measure the
resistance of each rod. Each rod should
measure 38.7 ohms.
e. Reconnect the heating rods and recheck the
resistance.
f. Move the thermostat housing back into place
and install the two mounting screws.
g. Switch on the electrical power and monitor the
operation of the primary heater to ensure it is
functioning properly.
The design of the primary heater allows it to
maximize the heat transfer from the power
available. However, under certain conditions,
reducing the flow rate is necessary when the
heater is not available to reach the required
temperature.