![ELECTRICAL (SOLID STATE THERMOSTAT IID)](/images/new-backgrounds/35683/3568351x1.webp)
ELECTRICAL (SOLID STATE THERMOSTAT IID)
If the pool/spa/hot tub water is too cold, troubleshoot the system as follows:
Check voltage at 24 V terminals.
VOLTAGE BETWEEN
Set control to max. temperature. After
VOLTAGE OUTSIDE RANGE
TEMPERATURE BELOW 105°F Disconnect sensor leads from circuit board. Measure sensor resistance with ohmmeter.
TEMPERATURE
RESISTANCE
Check water temperature; estimate expected sensor resistance from chart below.
RESISTANCE O OHMS (SHORT CIRCUIT) Check system for shorted wires or open circuits. Replace sensor if necessary.
MEASURED AND ESTIMATED RESISTANCE MATCH WITHIN 20 PERCENT.
Disconnect potentiometer leads from circuit board. Measure resistance with ohmmeter. If resistance is:
9k to 11k at maximum setting,
replace circuit board. Above 11k ohms but less than
15 k ohms, replace potentiometer.
Above 15k ohms, fix loose or broken wires; replace potentiometer if necessary.
Reconnect all leads and check out system.
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:
Check voltage at 24 V terminals.
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VOLTAGE BETWEEN |
| VOLTAGE OUTSIDE RANGE | |||||
Set control to max. temperature. After |
| Check transformer, 120 V supply, correct as | |||||
cycles, check water temperature. |
| necessary. | |||||
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TEMPERATURE ABOVE 108°F Disconnect sensor leads from circuit board. Measure sensor resistance with ohmmeter.
TEMPERATURE
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| RESISTANCE |
| RESISTANCE ABOVE 15k OHMS (OPEN | |||||
| Check water temperature; estimate expected |
| CIRCUIT) OR SHORT CIRCUIT. | |||||
| sensor resistance from chart below. |
| Fix loose or broken wires. Replace sensor if | |||||
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| MEASURED AND ESTIMATED RESISTANCE |
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| MEASURED AND ESTIMATED RESISTANCE | ||||
| MATCH WITHIN 20 PERCENT. |
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| DON'T MATCH. | ||||
| Disconnect potentiometer leads from circuit board. |
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| Replace sensor. Reconnect all leads and check | ||||
| Measure resistance with ohmmeter. If resistance |
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| 9k to 11k at maximum setting, |
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| replace circuit board. |
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| Above 11k ohms, replace |
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| potentiometer. |
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| 0 ohms (short circuit), replace |
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| potentiometer. |
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| Reconnect all leads and check out system. |
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SENSOR RESISTANCE AT VARIOUS TEMPERATURES
| Temperature |
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| (deg. F) | 61 | 68 | 70 | 77 | 86 | 88 | 95 | 104 | 106 |
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| 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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