To Next PageTo Next PageWhat to do if my GRE 777590 Heat Pump shows high pressure protection?
If your GRE Heat Pump displays a high pressure protection error, it could be due to too much refrigerant or insufficient air flow. You can discharge the excess refrigerant from the HP gas system or clean the air exchanger to resolve this.
What to do if my GRE 777590 shows low pressure protection?
If your GRE Heat Pump is showing a low pressure protection error, it could be due to several reasons: not enough refrigerant, insufficient water flow, or a jammed filter or capillary. To address this, check for gas leaks and refill the refrigerant if necessary, ensure the air exchanger is clean, and replace the filter or capillary if they are blocked.
Why is the cooling outlet water temperature too low on my GRE 777590?
If the cooling outlet water temperature of your GRE Heat Pump is too low, it might be caused by insufficient water flow. Check the water flow and ensure the water system isn't blocked or jammed.
Why is there a large temperature difference between water inlet and outlet in my GRE 777590?
If the temperature difference between the water inlet and outlet of your GRE Heat Pump is too high, it could be because the water flow volume is insufficient, or the water pressure difference is too low. Inspect the water flow volume to see if the water is jammed.
What does it mean when the flow switch is closed on my GRE 777590?
If your GRE Heat Pump's flow switch is closed, it may be due to low water flow, incorrect flow direction, or a faulty flow switch. Verify that the water flow is sufficient and moving in the correct direction. If the problem persists, the flow switch may be defective.
Why is my GRE Heat Pump activating first grade antifreeze protection?
If your GRE Heat Pump activates first grade antifreeze protection in winter, it's because the ambient or water inlet temperature is too low. The water pump will automatically run for first grade antifreeze.
Why is my GRE Heat Pump activating second grade antifreeze protection in winter?
If your GRE Heat Pump activates second grade antifreeze protection during winter, it indicates that the ambient temperature or water inlet temperature is too low. The heat pump will start heating for second grade antifreeze.
What to do if my GRE Heat Pump displays cooling condenser sensor failure?
If your GRE Heat Pump displays a cooling condenser sensor failure, it might be due to incorrect wiring at the gas return sensor position. Confirm there are no incorrect connections, and then restart the machine.
What to do if my GRE 777590 Heat Pump displays gas return sensor failure?
If your GRE Heat Pump is showing a gas return sensor failure, it could be due to incorrect wiring. Ensure there are no incorrect connections at this point, then restart the machine.
What does ambient temperature sensor failure mean on my GRE Heat Pump?
If your GRE Heat Pump is showing an ambient temperature sensor failure, it means the sensor is either in an open or short circuit. Check or replace the sensor to resolve this issue.
Detailed technical specifications for GRE heat pumps, including performance and power.
Important preliminary notes and rules for heat pump installation.
Guidelines for selecting the optimal location for the heat pump unit.
Specifies required distances from the swimming pool for optimal heat pump placement.
Instructions on installing a check-valve to protect the heat exchanger.
Illustrative diagram showing a typical heat pump system setup and connections.
Procedure for adjusting the bypass valve for optimal heat pump operation.
Guidelines and warnings for connecting the heat pump's electrical supply safely.
Step-by-step guide for the first-time startup and operation of the heat pump.
Explanation of condensation that may occur during heat pump operation.
Lists all included accessories with quantities and images.
Instructions on how to install various heat pump accessories.
Wiring diagram for models 777590, 777591, 778375.
Wiring diagram for model 778392.
Wiring diagram for model 778393.
Instructions for installing the external display unit.
Overview of the buttons and display functions of the LED controller.
Procedure for starting and stopping the heat pump unit.
How to select between heating and cooling modes.
Guide for setting the current time on the controller.
How to adjust the desired water temperature.
Instructions for programming automatic start and stop times.
How to cancel programmed automatic start/stop functions.
Method for viewing various operational parameters on the controller.
Procedure for adjusting operational parameters via the controller.
Displays and meanings of various status indicators on the controller.
Explanation of error codes displayed on the controller and their causes.
Troubleshooting guide for issues not shown on the LED controller display.
Detailed list of all parts of the heat pump with corresponding numbers.
Table showing pressure gauge readings for R410a at different temperatures.
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