Issues And Resolutions - Aquacal HeatWave SuperQuiet SQ175 Operation Manual

OtA Indicator
ISSUE
Incoming water temperature exceeded 110° F and the unit is locked with an OtA over temperature alarm.
The heat pump will not operate until incoming water temperature drops to 100° F or lower.
RESOLUTION
1. Determine if another heat source (gas heater, solar heater, etc.) is heating water being sent directly to the heat
pump with the OtA indicator. This situation will need to be corrected before continuing.
2. Rule out an incorrect reading from the water temperature sensor. Verify existing water temperature with an
accurate thermometer. If heat pump's sensor is inaccurate, the water temperature sensor may require
replacement.

5.2 Issues and Resolutions

WARNING - Failure to heed the following may result in injury or death.
Repairs must not be attempted by untrained or unqualified individuals.
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The heat pump contains refrigerant under pressure. Repairs to the refrigerant circuit must not be attempted by
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untrained or unqualified individuals. Service must be performed only by qualified HVAC technicians. Recover
refrigerant before opening the system.
CAUTION - Failure to heed the following may result in equipment damage.
Service by unauthorized personnel will void the factory warranty.
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Please perform the following troubleshooting.
For further assistance, please contact the installing dealer. Or contact AquaCal
service partner in your area. See "Contacting AquaCal AutoPilot, Inc." on page 1.
Display Panel Not Responding
1. If the heat pump is controlled be an external controller, confirm the external controller settings. See
"Operating Heat Pump (With an External Controller)" on page 8.
2. If the issue is still occurring, contact the installer or manufacturer of the external control device.
Heat Pumps Not Running
1. Confirm equipment is receiving power. Is the heat pump display illuminated?
If not, confirm the main breaker (located at the power supply panel) and the disconnect switch (located
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near the heat pump) are both turned on.
If the display still does not illuminate, it is recommended that the heat pump installer or electrician
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confirms heat pump is receiving power.
2. Confirm correct mode is selected. See "Setting Operating Mode" on page 5.
3. Confirm thermostat is set correctly. See "Setting Thermostats" on page 5.
If heating the water, the thermostat should be set above the current water temperature.
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If cooling the water, the thermostat should be set below the current water temperature.
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4. If an error code is displayed, diagnose and correct the cause of the code. See "Fault Codes" on page 16.
5. If the heat pump is using an external controller, the heat pump may not be set correctly to accept the
controller's signal.
See "Operating Heat Pump (With an External Controller)" on page 8.
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Heat Pumps Tripping Breaker
1. Have an electrician confirm breakers are in good condition and properly sized for the heat pump.
2. Multiple heat pumps installed at the same site may benefit from special automatic sequencing controllers to
avoid excessive power drops at start-up. See "Automatic Sequencing Controller" on page 22.
3. If a fault occurs immediately when the compressor starts, a qualified technician should evaluate the system.
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