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3.3 Heater Operation
The pool and spa heater LED and the solar LED are two-color LEDs. Green indicates the heater is enabled but not on.
Red indicates the signal to the heater relay is being sent. A heater or solar LED will remain green for the following
reasons:
1. Thermostat setting has been reached.
2. Thermostat setting is below the water temperature.
3. Water temperature sensor has failed.
4. Other body of water is circulating (i.e., pool heater is enabled but spa is circulating).
To eliminate the control system as the cause of the heating problem, insert both wires to the heater into the same
terminal of the green terminal bar, as shown in Figure 8. If the heater does not operate, the problem is in the wires or
the heater, not the control system. Reinsert wires into the correct terminals after the test.
S1
S2
654321
10987654321
4321
4321
RESET
SERVICE
TIME OUT
FILTER PUMP
AUX 1
A
UX 2
AUX
3
A
UX
4
A
UX 5
AUX 6
AUX
7
RS6 & RS8 ONLY
RS8 ONLY
HEATER
SOLAR
POOL MODE
SPA MODE
SPA DRAIN
SPA FILL
AUTO
To Heater
Figure 8. Connecting Both Heater Wires to the Same Terminal for Testing
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