28
P/N 38033 Rev. C 12-1-00
Troubleshooting
THE SERVICE LIGHT
This list will suggest situations that might cause this symptom.
1. The primary responsibility for the Service Light is to illuminate whenever there is a trial for pilot.
After the Pilot Ignitor sparks, gas flows through the pilot orifice where it is ignited by the spark and
a pilot flame is established, the spark goes out and the Service Light goes out. If the Service Light
stays On and the pilot continues to spark and still no pilot flames is established - check for:
A. Gas line NOT bled.
B. Pilot Orifice plugged.
C. No Voltage at P.V. Terminal at Gas Valve.
D. Defective Gas Valve.
2. The Service Light will also come On if the Pilot goes out due to a bad or loose ignition wire or
anything that would cause the pilot to restart the spark sequence. So if the Service Light comes On
and the heater stops firing and then the heater fires and the Service Light goes out, simulating a
Rapid Cycle, it can be caused by a loss or weak signal to the Module, by the Pilot.
3. The Service Light will come On if the water temperature in the Header reaches the High Limit
Switch Temperature (150 degrees). To confirm this, check the 3 lights on the back of the board. (The
High Limit Light is the first one in sequence.) If the Hi-Limits were causing the cycling, the 3 lights
would flash Off and On as the heater shut down and refired.
NOTE
If a weak pilot signal causes the cycling, the Service Light will go On and Off, but the High
Limit Light will remain On. If water temperature causes the cycling, the Service Light will go
On and Off AND the High Limit Light will go On and Off as well.
SPA
COM POOL
TPROBE
OUT RETURN
24 VAC
HILMT
IGNITION MOD
EXT SWITCH
PACFAB MODEL 6800
ELECTRONIC THERMOSTAT
POOL / OFF/SPA
FRONT PANEL
THERMOSTAT SELECT SWITCH
TFUSE VALVE
PRESS
POTENTIOMETER
POTENTIOMETER
SPA
POOL
PVALV LED
TFUSE LED
HITEMP LED
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