Here you can quickly find answers to frequently asked questions.

Alarm NR.4

CAUSE: If the evaporator falls below 19°C, the heat pump stops. Error no. 4 appears in the display. The temperature is outside the heat pump's operating range.
REMEDY: The heating rod must take over the heating. For gas defrosting, check if the solenoid valve opens during defrosting. Wait until the temperature is within the heat pump's operating range.

Water droplets coming out with the exhaust air?

CAUSE: This is due to high humidity in the intake air. This has no influence on the operation of the heat pump. This will typically happen the 1st time the heat pump is started up. It can also occur if clothes are being dried in the same room as the heat pump takes air from.

The hot water gets cold with high consumption?

CAUSE: The heat pump can deliver approximately 320L of hot water in a stretch of 40°C hot water at a starting temperature of 55°C in the tank. If the hot water demand is higher, the heat pump will not be able to keep up. The heating rod will therefore help with the heating if it is connected.
REMEDY: Check if the heat source combination with the heating rod is activated.

Water running out onto the floor?

CAUSE: Check that the heat pump is level. Check that the water drains correctly into the collection tray. Check that the drain hose from the defrost water drain is not blocked.
REMEDY: Put the heat pump in water. Install the collection tray correctly. Clean the drain hose.

Display is not active, data readout is not possible?

CAUSE: If the display has been dismounted and not mounted correctly on the base PCB. Static electricity can knock out the display.
REMEDY: Install the display connector correctly in the base PCB. Replace the display. Check if the earth wire is correctly mounted on the overdoor.

No light in panel?

CAUSE: Check the fuse. Check if the mains plug is plugged into the wall socket. Check if the switch on the wall is switched on. Check if the heat pump is switched on.
REMEDY: Change the fuse if necessary. Insert the plug into the power socket. Switch on the power outlet. Switch on the heat pump.

Compressor does not start?

REASON: There is a built-in delay of 5 minutes from compressor stop to new start. Only for models with electronic control.
REMEDY: Wait 5 min. and check the compressor again.

The compressor runs all the time and the water doesn't get hot enough?

CAUSE: A radiator/underfloor heating is connected to the heat pump and the need for underfloor heating is greater than the heat pump can keep up with. The evaporator is blocked. There may be a leak in the cooling system, all or some of the refrigerant has been lost. Measure the temperatures in the cooling system to check.
REMEDY: Install the thermostat so that the domestic water always has 1st priority. Carefully clean the evaporator with clean water. Find the leak and repair it, top up refrigerant. Quantity: See type plate.

The compressor runs continuously, the water is hotter than specified, the high-pressure compressor switch trips (alarm no. 5)?

CAUSE: The sensors are not placed correctly in the sensor pockets. The sensors should be placed at the bottom of the sensor pockets.
REMEDY: Insert the sensors correctly into the sensor pockets.

Condensation drain dripping?

CAUSE: Condensation occurs during the heating process. This happens when the surface temperature of the evaporator is below the dew point temperature of the intake air.
REMEDY: Condensation is collected in the drip tray and led through the attached drip hose to the floor drain.

The cooling system trips on the high-pressure pressostat (alarm no. 5)?

CAUSE: The ambient temperature is higher than +35°C and the cooling system trips on the high pressure compressor. The cooling system has reached its maximum temperature. This may be due to too little or no air flow over the evaporator.
REMEDY: Wait for a lower ambient temperature and activate the high pressure pressostat by pressing the reset button. Carefully clean the vaporiser with clean water. Set the fan speed to max. Activate the high-pressure pressostat.

The cooling system trips the high-pressure pressostat and the water becomes very hot (alarm no. 5)?

CAUSE: The cooling system has reached its maximum temperature and switches off the high pressure pressostat. The maximum constant temperature must not exceed 55°C. However, the Legionella control function will increase the temperature to 65°C once a week.
REMEDY: Replace the thermostat/sensors if defective. Activate the high pressure pressostat by pressing the reset button.

The safety valve on the cold water pipe is dripping?

CAUSE: When the water is heated it expands and the water pressure increases. The safety group on the cold water pipe prevents the water from flowing back. The valve will therefore take the excess pressure by letting some water out. The pressure in the tank must never exceed 10 Bar.
REMEDY: It is normal for water to occasionally come out of the safety valve during the heating process.

The water doesn't get hot enough?

CAUSE: The operating thermostat is set too low.
REMEDY: Set the operating thermostat to a higher temperature.

The heat pump has just started up and the water is not getting hot?

REASON: It takes approximately 8 hours at 20°C air temperature to heat the water to 55°C. At lower air temperatures it takes longer.
REMEDY: Switch off the radiator/floor heating circuit, if installed. Switch on auxiliary heating if necessary. Electricity/boiler.

Heat pump not working?

REASON: Is there light in the panel.
REMEDY: Switch on the heat pump.