IVT heat pump error codes

The electric additional heat begins to be stepped down. The warning is activated in additional heat mode if the sensor T8 approaches the highest temperature permitted for T8. The warning is blocked during hot water peaks or extra hot water.

Communication with the controller has been interrupted. The controller executes a new start if the alarm is still active after two hours. If more than three new starts have been carried out within one hour, the alarm Too high boot count I/O board BAS x (category A), Æ Chapter 17.9.7 .

Depends on the board.

Activated when communication with the room sensor is terminated.

Electric cassette (EK) alarm: the electric additional heater miniature circuit-breaker or overheat protection has tripped.

The electric heater is turned off. The warning is activated in additional heat mode if the sensor T8 exceeds 80 °C.

Activated when voltage 0-10V for temperature falls below 0.5V or exceeds 8V. Also activated when voltage 0-10V for humidity falls below 0.5V or exceeds 9.8V. Cooling on current mixing valve is aborted. The alarm may appear after a power failure but the alarm cause normally disappears automatically and the only thing that has to be done is to acknowledge the alarm.

The alarm is activated when the sensor's value indicates a temperature lower than -1 °C. In the event of a failure on sensor T5, the room temperature influence is set to 0.

The compressor stops because the hot gas cut-out cannot be guaranteed. Activated when the sensor's value indicates a temperature lower than -50 °C.

Activated when the sensor's value indicates a temperature lower than 0 °C. To be able to make hot water, T8 is set at a temperature calculated according to the following formula: T8 = T9 + Compressor x 7K + 0.07K x current output in operation. The active compressor provides Compressor = 1 and current output in operation means additional heat in %. Compressor operation and 50% additional heat then give T8 = T9 + 10.5K. Compressor off (Compressor = 0) and no additional heat (0%) give T8 = T9.

Activated when the sensor's value indicates a temperature lower than 0 °C. T9 is calculated according to the following formula: T9 = T8 - Compressor x 7K + 0.07K x current output in operation.

Activated when the sensor's resistance value indicates a temperature lower than -20 °C. In the event of a failure, T10 is set at a temperature calculated according to the following formula: T10 = T11 + Compressor x 3K.

Activated when the sensor's value indicates a temperature lower than -50 °C. In the event of a failure, T11 is set at a temperature calculated according to the following formula: T11 = T10 - Compressor x 3K.

The alarm is activated when the sensor's value indicates a temperature lower than 0 °C. The flow temperature T1 becomes identical to T8. If there are several heat pumps installed, T1 = T8 for the heat pump that does not produce hot water and has the highest value on T8. Additional heat mixing valve shut.

The alarm is activated when the sensor's value indicates a temperature lower than 0 °C. The mixing valve for the circuit is closed completely.

Activated when the sensor's value indicates a temperature lower than -10 °C. The sensor is used in the collector circuit for cooling in order to prevent the heat exchanger from freezing. The mixing valve in the collector circuit is closed.

The alarm is activated when the sensor's value indicates a temperature lower than -1 °C. In the event of a failure on sensor T5, the room temperature influence is set to 0.

The alarm is activated when the sensor's value indicates a temperature lower than -50 °C. In the event of a failure on T2, the outdoor temperature is set to 0 °C.

The alarm is activated when the sensor's value indicates a temperature lower than 0 °C. The hot water production is terminated.

The electric heater is turned off. Activated by tripped overheat protection on the electric additional heat, high flow temperature or too high temperature in electric additional heat. The automatic trip fuse to the electric additional heat may have been tripped due to, for example, a short circuit.

External additional heat refers to additional heat which is controlled as mixed additional heat or via 0-10V signal. If the alarm signal from the additional heat has been connected to 10 - C on the PEL board, the alarm can be given when an error occurs. The type of error depends on the connected unit.

The alarm is activated when the anode in the hot water heater is broken or does not work. Presupposes that Yes is indicated in Protective anode installed.

Compressor temperature T6 (GT6): the working temperature of the compressor is too high.

Heat transfer fluid out max T8 (GT8): the safety sensor stops the compressor because the water going out to the radiators is too hot.

High heat transfer fluid delta T8/T9: temperature difference between sensors T8 (GT8) and T9 (GT9) too high.

High return to the heat pump T9 (GT9): compressor stopped because return water temperature is too high (limit approx. 58°C).

HTF in under limit T10 (GT10): brine (heat transfer fluid) temperature into the heat pump below the limit.

HTF out under limit T11 (GT11): brine temperature out of the heat pump below the limit.

The compressor stops because the flow temperature is too high for the heating circuit. Activated when the sensor shows a value which is 5K higher than the highest set point value for the circuit. The factory setting for the highest set point value is 60 °C for radiator type of circuit and 35 °C for underfloor type of circuit After hot water production, the alarm is delayed with 4 min.

The information is given if the temperature of the heating medium is too high. The information can appear temporarily when high room and hot water temperatures are set.

Compressor stops. Activated when the temperature on sensor T6 exceeds the applicable maximum hot gas temperature.

The warning is activated when the difference between sensor E2x.T10 and E2x.T11 exceeds 6K. 30 min after compressor start and change of production mode, the temperature difference is measured and if it is too big, the warning is given after a delay of 15 min. The warning is not given when the compressor is inactive.

The warning is activated when the difference between sensor E2x.T8 and E2x.T9 exceeds 13K. 10 min after compressor start and change of production mode, the temperature difference is measured and if it is too big, the warning is given after a delay of 3 min. The warning is not given when the compressor is inactive or when additional heat is allowed.

The hot water has not come up at the right temperature. The hot water peak is repeated at the same time on the next day.

Pressure switch high (HP) tripped.

If Alarm at low pressure in collector circuit is selected and the external input closes, this alarm is triggered. The compressor stops (Æ Chapter 16.6 ).

Warning/alarm is given if the temperature of the collector circuit in is too low. First, a warning is given. If the warning appears several times during a certain time period, the warning transforms into a category A alarm. For settings of T10: (ÆChapter 16.9 ).

Warning/alarm is given if the temperature of the collector circuit out is too low. First, a warning is given. If the warning appears several times during a certain time period, the warning transforms into a category A alarm. For settings of T11: (ÆChapter 16.9 ).

Low pressure switch (LP) tripped.

Motor cut-out compressor (MB1): the compressor motor cut-out has tripped.

Motor cut-out HTF (heat transfer fluid / brine) pump (MB2) - models C11, E11, E14, E17.

Activated when the compressor's motor cut-out has tripped because of high current or lost current phase resulting in undue strain on the compressor. Alarms may also be due to alarms from the soft starter (Æ Chapter

Activated when the collector circuit pump motor cut-out has tripped. The collector circuit pump stops and the compressor also stops so as to prevent the evaporator from freezing.

The electric heater is turned off. If alarm output from the electric heater has been connected to the multi module, the alarm is given when an error occurs.

The compressor stops when the phase guard trips because of the lack of a phase or the presence of a phase sequence error. A voltage difference > 15 % between the phases also results in an alarm.

Phase sequence fault: one or two phases down, or phase sequence to the heat pump incorrect.

Power failure: one or two phases to the heat pump are down.

Activated when the set point value for a drying step has not been reached.

Sensor fault: any connected temperature sensor (e.g. GT1 return radiator) gives an alarm when defective; display shows the sensor designation.

The alarm is activated when the sensor's value indicates a temperature higher than +70 °C. In the event of a short circuit on sensor T5, the room temperature influence is set to 0.

The compressor stops because the hot gas cut-out cannot be guaranteed. Activated when the sensor's resistance value indicates a temperature higher than 150 °C.

Activated when the sensor's value indicates a temperature higher than 110 °C. T8 is calculated according to the same formula as in the event of a failure Æ Chapter 17.9.25 ).

Activated when the sensor's value indicates a temperature higher than 110 °C. T9 is calculated according to the following formula: T9 = T8 - Compressor x 7K + 0.07K x current output in operation.

Activated when the sensor's value indicates a temperature higher than 70 °C. In the event of a short circuit, T10 is set to an estimated temperature using this formula: T10 = T11 + Compressor x 3K.

Activated when the sensor's value indicates a temperature higher than 70 °C. In the event of a short circuit, T11 is set to an estimated temperature using formula: T11 = T10 - Compressor x 3K.

The alarm is activated when the sensor's value indicates a temperature higher than 110 °C. The flow temperature T1 becomes identical to T8. If there are several heat pumps installed, T1 = T8 for the heat pump that does not produce hot water and has the highest value on T8. Additional heat mixing valve shut.

The alarm is activated when the sensor's value indicates a temperature higher than 110 °C. The mixing valve for the circuit is closed completely.

Activated when the sensor's value indicates a temperature higher than 30 °C. The sensor is used in the collector circuit for cooling in order to prevent the heat exchanger from freezing. The mixing valve in the collector circuit is closed.

The alarm is activated when the sensor's value indicates a temperature higher than +70 °C. In the event of a short circuit on sensor T5, the room temperature influence is set to 0.

The alarm is activated when the sensor's value indicates a temperature higher than +70 °C. In the event of a short circuit on T2, the outdoor temperature is set to 0 °C.

The alarm is activated when the sensor's value indicates a temperature higher than +110 °C. The hot water production is terminated.

The compressor stops until the hot gas temperature falls below the set limit. The warning can occur when the heat pump works close to the lowest permitted outdoor temperature.

Activated when the pressure in the refrigerant circuit becomes too high. If the information appears several times during a certain time period, the information transforms into a category A alarm (Æ Chapter 11.7.3).

Activated when the pressure in the refrigerant circuit of the heat pump becomes too low. If the information appears several times during a certain time period, the information transforms into a category A alarm (Æ Chapter 11.7.2).

Ongoing hot water operation is aborted and replaced with heating operation. The warning can occur when the heat pump works close to the lowest permitted outdoor temperature.

Activated when the flow temperature of a circuit falls below 8° C a n d t h e 1 0 - m i n t i m e r h a s c o u n t e d d o w n .

Compressor stops. Is activated if the controller has executed more than three new starts after the alarm Check CANbus cable connection, (Æ Chapter 17.9.40 ).

The compressor is stopped because of too high pressure in the refrigerant circuit. Activated on open contact on the high pressure switch.

The compressor is stopped because of too low pressure in the refrigerant circuit. Activated on open contact on the low pressure switch. The alarm is delayed with 150s after compressor start or alternation between hot water and heating production.