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Hi-E Model EPH Pool and Spa Heater
Figure 2. Venturi/Negative Pressure Regulator System
filters, and strainers, water valves, gas supply, electri-
cal power and time clocks, have an effect on heater
operation. The following basic checks should be
performed:
1. Is electrical power to the heater turned on?
2. Is there a time clock or other control in the system,
and is that control on?
3. Is the heater turned on at the touch panel? If it is,
the light over the active temperature control will
be lit.
4. Is the temperature control knob set high enough to
call for heat?
5. Is the gas supply turned on at all locations?
6. Is the heater’s combustion air filter clean?
7. Are all wiring connections solid?
8. Is the ignition control in lockout mode? Turn the
heater off and then back on at the touch panel to
restart the ignition sequence.
If all of these items have been checked, look for
less obvious problems (see Section 3, Troubleshoot-
ing).
2E. Temperature Rise Test Procedure
A temperature rise test confirms proper water flow
through the heater. Perform a temperature rise test as
follows:
1. Verify the heater is OFF. If it is necessary to turn
the heater off, push the OFF button at the touch
pad (see Fig. 3) and wait at least 3 minutes.
2. Turn the filter pump OFF.
3. Remove the 1/4 inch (6.35 millimeters [mm])
National Taper Pipe (NPT) plug located on the
inlet/outlet header (see Fig. 4) and replace it with a
Pete's plug.
4. Insert a pocket thermometer through the Pete's
plug into the header to a depth of about 5 inches
(127 mm).
Figure 3. Temperature Control
