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ELECTRICAL (SOLID STATE THERMOSTAT MILLIVOLT)
If the pool/spa/hot tub water is too cold, troubleshoot the system as follows:
Check voltage at + and - terminals.
VOLTAGE BETWEEN + 0.2 V and 0.75 V.
(Polarity is critical)
Set control to max. temperature. After 2-3
cycles, check water temperature.
TEMPERATURE BELOW 105°F
Disconnect sensor leads from circuit board.
Measure sensor resistance with ohmmeter.
RESISTANCE 1-14k OHMS.
Check water temperature; estimate expected
sensor resistance from chart below.
MEASURED AND ESTIMATED RESISTANCE
MATCH WITHIN 20 PERCENT.
Disconnect potentiometer leads from circuit board.
Measure resistance with ohmmeter. If resistance is:
0-100 ohms at minimum setting:
9k to 11k at maximum setting,
replace circuit board.
Above 11k ohms, replace
potentiometer.
0 ohms (short circuit), replace
potentiometer.
Reconnect all leads and check out system.
VOLTAGE OUTSIDE RANGE + 0.2 V and 0.75 V.
Check pilot generator, correct as necessary.
TEMPERATURE 105-108° F.
Control ok.
NOTE: 108°F is the upper control limit.
RESISTANCE O OHMS (SHORT CIRCUIT) OR
OPEN CIRCUIT GREATER THAN 14 K.
Check system for shorted wires or open circuits.
Replace sensor if necessary.
MEASURED AND ESTIMATED RESISTANCE
DON'T MATCH.
Replace sensor. Reconnect all leads and check
out system.
If the pool/spa/hot tub water is too hot, troubleshoot the system as follows:
VOLTAGE OUTSIDE RANGE + 0.2 V and 0.75 V.
Check pilot generator, correct as necessary.
TEMPERATURE 105-108° F.
Control ok.
NOTE: 108°F is the upper control limit.
RESISTANCE ABOVE 15k OHMS (OPEN
CIRCUIT) OR SHORT CIRCUIT.
Fix loose or broken wires. Replace sensor if
necessary.
MEASURED AND ESTIMATED RESISTANCE
DON'T MATCH.
Replace sensor. Reconnect all leads and check
out system.
Check voltage at + and - terminals
VOLTAGE BETWEEN + 0.2 V and 0.75 V.
(Polarity is critical)
Set control to max. temperature. After 2-3
cycles, check water temperature.
TEMPERATURE ABOVE 108°F
Disconnect sensor leads from circuit board.
Measure sensor resistance with ohmmeter.
RESISTANCE 1-14k OHMS.
Check water temperature; estimate expected sen-
sor resistance from chart below.
MEASURED AND ESTIMATED RESISTANCE
MATCH WITHIN 20 PERCENT.
Disconnect potentiometer leads from circuit board.
Measure resistance with ohmmeter. If resistance is:
0-100 ohms at minimum setting;
9k to 11k at maximum setting,
replace circuit board.
Above 11k ohms, replace
potentiometer.
0 ohms (short circuit), replace
potentiometer.
SENSOR RESISTANCE AT VARIOUS TEMPERATURES
Temperature
(deg. F) 61 68 70 77 86 88 95 104 106
Resistance (k ohms) 14.92 12.49 11.88 10.00 8.06 7.69 6.53 5.33 5.10
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