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What to do if a fault occurs
Control unit Rego 637
The control unit is the brains of the heat pump. It makes sure the heat
pump gives the best energy savings and that it runs for many years. The
control unit controls and monitors the heating and hot water supply in
your house. The monitoring function is especially important. It shuts
down the heat pump in the event of operational disturbances so that no
critical parts are damaged.
Electric heater gives more output
When the heat pump cannot manage to heat the house by itself, for
example, if there is a considerable drop in the outdoor temperature, the
control unit ensures the additional electric heater is connected. The heat
pump and electric heater help to maintain the temperature required in
the house. The electric heater only adds the output necessary for the
heat pump to be able to produce the right temperature. When the heat
pump can once again manage heating on its own the electric heater is
automatically disconnected.
Domestic hot water (DHW) is given priority over
central heating water
In a house with water based heating a difference is made between
central heating water and domestic hot water (DHW). The central
heating water is for radiators/underfloor heating and domestic hot water
(DHW) is for showers and taps. The hot water heater is fitted with a
sensor that measures the temperature of the hot water. The unit ensures
that priority is given to the domestic hot water (DHW) over the heating
demands.
Sensor fault
All sensors connected to the heat pump can give an alarm when
defective. In the example to the right it is sensor T1 (GT1), Return
radiator, which has given an alarm. All sensors give alarms in the same
way. Read more about the sensors under heading Read the temperatures
on the heat pump.
Possible cause 1: Temporary error.
Action:
1. Monitor performance of product.
Possible cause 2: Short circuit or broken sensor cable.
Action:
1. If you have a multimeter you can disconnect the
sensor and check the cables resistance. Compare
with the sensor table in the section Technical
information.
Possible cause 3: Defective sensor or incorrect connection.
Action:
1. Replace sensor/check connection.
HTF in under limit T10 (GT10) and HTF out
under limit T11 (GT11)
Possible cause 1: Temporary low heat transfer fluid
temperature.
Action:
1. Monitor performance of the heat pump.
2. If the alarm returns, contact Technical
Department.
Possible cause 2: Too low flow on the collector circuit.
Action:
1. Check the filter.
2. Clean the filter if it is blocked.
Possible cause 3: The minimum heat transfer fluid temperature
has been set too low.
Action:
1. If the alarm returns, contact the Technical
Department.
In a ground water system the cause may also be:
Possible cause 4: Blocked filter in the groundwater circuit.
Action:
1. Clean the filter.
Possible cause 5: The motor cut-out or a fuse on the pump in
the groundwater system has tripped.
Action:
1. Reset the motor cut-out or fuse.
Possible cause 6: Faulty pump in the groundwater circuit.
Action:
1. Contact the Technical Department.
Switch off the power before checking
the resistance of the cable.
The factory settings are 0°C and -2°C
respectively. If anti-freeze liquid is used
these values need to be changed.
Contact your installer.
Control unit Rego 637
Note
Note
TECHNICAL INFORMA
TION
FOR THE USER
FOR THE INST
ALLER
TECHNICAL INFORMA
TION
FOR THE USER
FOR THE INST
ALLER
Three-way
valve
Electric heater
Control unit
Alarm
(GT1)
Sensor return rad.
040622 16:08:15
Info
Ackn.
Alarm
(GT10)
Pump inlet too cold
040622 16:08:15
Info
Ackn.
Alarm
(GT11)
Pump outlet too cold
040622 16:08:15
Info
Ackn.