Frequently asked questions

Find out our frequently asked questions, which you can conveniently find by different topics.

Maalämpö – vianmääritys

Failures in technical equipment usually occur without a warning – and ground source heating equipment is no exception. Failures in ground source heating equipment often manifest themselves as unexpected problems in heat distribution, but also as alerts given by the equipment.

Do you suspect there might be something wrong with your ground source heating equipment? Take a look at these frequently asked questions – the answer might be found below!

  1. Look for a problem code on the ground source heating pump control panel and write it down. Check whether the heat pump has a software restart or reset function. If it does, restart the system. If the equipment does not have a reset function or a software restart does not solve the issue, switch off the device from the main switch and wait for 5 minutes before switching it on again.
  2. If the fault reoccurs after start-up, then it is probably a fault that requires an acknowledgement of the overtemperature protector, for example.
  3. Be sure to check both the power supply fuses of the ground source heat pump at the property’s power room as well as the fuses of the actual ground source heat pump.
  4. If the fault persists, contact maintenance. When contacting maintenance, be sure to report the problem code and the measures you have already taken with the heat pump.
  1. Check if the equipment is in failure (point A).
  2. Check the heating curve settings and the current setpoint.
  3. Check whether the pump has gone into summer stop mode or lowered mode.
  4. Check that the room thermostats are open and set correctly.
  5. Clean the waste collector on the heating side. See cleaning instructions in this video.

Ground source heat terminology

We have compiled in our ground source heat terminology the most common terms used for ground source heat and its utilisation including explanations. Check out the key ground source heat terminology so that you know what we’re talking about.

Sensors measure temperature, pressure, etc. The operation of the heat pump is adjusted on the basis of the sensor measurements.

Automation controls the operation of the heat pump’s compressor, circulation pumps and other peripherals based on the measurements.

The kilowatt-hours (kWh) used in a year to heat a house and domestic water. The energy requirement includes the total electricity consumed by all of the electrical appliances in the house.

The indicative energy requirement distribution of a detached house could be, for example: heating 52%, domestic electricity 28%, domestic hot water 20%. In a ground source heated detached house, the production of heating and domestic hot water typically takes up 60% of the energy, and the domestic electricity takes up the rest.

The room sensor measures the indoor temperature of the property.

The effect of the room sensor on the adjustment result. If the effect is big, room temperature alterations have a greater impact on the adjustment result.

The expansion coil is a heat exchanger that transfers the heat collected from the ground to the refrigerant. In the expansion coil, the refrigerant turns from liquid into steam.

The inverter, or the frequency converter, can be used to control, for example, the heat pump’s compressor to reach the appropriate speed.

Cascade connection means connecting several heat pumps to operate in the same system such that they can be adjusted as one.

The heat pump uses the heating energy collected from the brine circuit. Usually from heat wells, horizontal piping to a field or other “residual” heat, for example, from exhaust air or some process.

A compressor increases the pressure of the vaporised refrigerant, simultaneously raising its temperature.

Refrigerant is a heat exchange agent used in the cold process. The state of the refrigerants used in heat pumps changes during the different stages of the process from liquid to gas and back.

A charging pump transfers the heating energy created by the heat pump to heat domestic water or the property.

A condenser transfers heat from the refrigerant to heat the property or domestic water. The condenser also changes the state of the refrigerant from gas to liquid/a mixture of liquid and steam.

A dirt filter collects debris from water or brine. If the filter is blocked, circulation water pumps are unable to circulate water or brine in the system.

Seasonal Coefficient of Performance, or SCOP, indicates the efficiency of the ground source heat pump better than COP (see Coefficient of Performance) because it takes into account the variations between different heating periods.

SCOP is calculated for four different heating periods because the temperature intervals applied to the calculation, the basic temperature measurements and the dimensioning loads are seasonal.

In addition, geographical climate zones are taken into account when calculating the heat coefficients of ground source heat pumps. In northern Europe, the calculation of a heating period heat coefficient is based on the climate conditions of Helsinki.

For example, the Gebwell Aries 6 inverter ground source heat pump (0°/35°) has a SCOP value of is 5.6. The corresponding SCOP value of the Aries 12 ground source heat pump is 5.8.