Danfoss Heat Pump Troubleshooting Manual Download Page 1

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Technical documentation | Air and ground source heat pumps

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Heat Pump

Troubleshooting Guide

Error

phase

sequence

Working pressostat and high pressure pipe

Alarm

high

pressure

Alarm

low

pressure 08

Alarm

motor

protection

Alarm

Circulation

pump

Alarm

Brinepump

Alarm

Brine

Alarm

Sensor

Alarm

communication

Alarm

Aux.heater

Sound

Temperature or the quantity of hot water

Thermal

comfort

High operating time additional heater

Outdoor unit and defrosting problems

Room

sensor

digital

Electric hot water heaters

Summary of Contents for Heat Pump

Page 1: ...h pressure 05 Alarm low pressure 08 Alarm motor protection 10 Alarm Circulation pump 12 Alarm Brinepump 13 Alarm Brine 14 Alarm Sensor 15 Alarm communication 16 Alarm Aux heater 17 Sound 18 Temperatur...

Page 2: ...e compressor runs check the discharge pipe temperature by feeling it with your hand The discharge pipe must be hot not lukewarm even slightly away from the compressor if the phases are in the correct...

Page 3: ...switch or discharge pipe sensor has broken the circuit In normal operation this is displayed after completed hot water production but can also be shown at high supply temperature in the heating system...

Page 4: ...atus and a digital thermometer check that the unit s cooling and overheating is correct for the specific refrigerant If cooling is not at the correct level compared with the specific refrigerant and i...

Page 5: ...re at the fuse and the relay card See wiring diagram If there is current there check the wiring between relay card and circulation pump If there is current the circulation pump has jammed If this is t...

Page 6: ...g If it jams clean replace the insert or replace with a newer LK exchange valve Note When changing to LK one must replace both motor and valve because this is the twisting type Cable break or loose ca...

Page 7: ...the heating system Ensure that there is a sufficiently large water volume for the heat pump to work against i e for the heat pump to give off its heat to approx 14 15 litres kw heat pump at smaller vo...

Page 8: ...connect the cables from the low pressure switch and relay card to do this The low pressure switch opens too soon Action Check that the low pressure switch opens at the right pressure done with a manom...

Page 9: ...oning documentation If the active collector is too short the heat pump cannot receive enough energy from the heat source which results in the heat pump requiring an addition to cover the energy requir...

Page 10: ...on the soft starter the soft starter releases all three phases down to the compressor If the soft starter has signal but is unevenly loaded by amperes on the phases or if it breaks to MS alarm Try co...

Page 11: ...tection Action Check the supply to the motor protection soft starter compressor Measure so that one can see where the supply disappears try pulling at the cables to see if there is any play If a cable...

Page 12: ...e 0 10V signal between terminals 329 and 330 Go into the service menu and run the circulation pump in manual mode 30 3V 40 4V 50 5V etc If the correct control signal is obtained there is a relay card...

Page 13: ...rculation pump s 0 10V signal Measure the 0 10V signal between terminal 333 and 334 Go into the service menu and run the circulation pump in manual mode 30 3V 40 4V 50 5V etc If the correct control si...

Page 14: ...when the temperature on BRINE OUT is as low or lower than the set value on ALARM BRINE In the factory setting this function is inactive If the problem is caused by a faulty setting in the ALARM BRINE...

Page 15: ...pump and outdoor sensor is not damaged in anyway by nails pins or another cable securing device This is a commonly occurring fault If the sensor does not give a correct value the sensor is defective T...

Page 16: ...he relay card drops the heat pump will stop while older heat pumps produced before Autumn 2008 will run as usual with the most recent setting Alarm com Air DHP A Action Check if the cable between the...

Page 17: ...has jammed If it has jammed open the bleed screw and try to release the paddle wheel using a screwdriver for example does not apply to optimum pumps Check that all the shut off valves are open if not...

Page 18: ...rrectly connected but still correct Check if the discharge pipe temperature rises quickly if it does not switch L1 and L3 When the compressor is running check the discharge pipe temperature by feeling...

Page 19: ...compressor noise the compressor itself may be defective and needs to be replaced Noise from the soft starter Action Measurement check the input and output phases for the soft starter as well as the c...

Page 20: ...prevent transmitting vibration it is recommended that flexible hoses are used for all pipe connections To avoid noise caused by pipe mountings a rubber coated pipe clamp should be used to prevent the...

Page 21: ...e for example Vibration noise from the electrical installation Action Check for electrical steps or similar devices screwed to the heat pump and wall These can cause vibrations and noise The heat pump...

Page 22: ...ning times set the value down to factory setting If the system has a high 8 C brine temperature you may have to reduce the start value further for a longer running time Sensor error hot water sensor A...

Page 23: ...ssure switch that screws directly onto the schrader socket service outlet to avoid having to open the refrigerant circuit Insufficient exchange surface to transfer the heat pump s output to the heater...

Page 24: ...emperature is maintained regardless of the outdoor temperature MIN Lowest set point value on the supply line regardless of the outdoor temperature except with heat stop Sensor fault Outdoor room suppl...

Page 25: ...otor but the arm does not shift mode Replace either the 3 way insert or the whole 3 way NOTE If the white lever on the motor goes up and down all the time there is a short circuit in the motor replace...

Page 26: ...to the relay card Use multimeters with buzzer to fault trace the cable between the control card and the shunt If there is voltage to the motor and the motor shifts mode as it should replace the 3 way...

Page 27: ...art The groove of the white six edged sleeve must be towards 3 o clock in unaffected mode Adjust the motor as illustrated Then screw the motor into place and press the knob to Auto mode Manual mode wh...

Page 28: ...tructions for the relevant model Peak heat operation occurs in connection with hot water production with the set interval Room Action Reduce the Room set point value 1 degree increase in room set poin...

Page 29: ...e sensor is defective replace it The compressor runs backwards Action Check that the phases for the heat pump are correctly connected only applies to 3 phase heat pumps If the compressor runs backward...

Page 30: ...e outdoor section via walls in the house Defrosting problems Action For a defrosting to occur the control computer calculates the difference between the defrost sensor and brine in On older models the...

Page 31: ...the motor switches position when testing but defrosting still does not function remove the motor and try closing and opening the valve by hand by pressing in the spring loaded spindle If it should be...

Page 32: ...ALUE FOR SUPPLY 0 20 C 22 C 40 C 1 20 C 22 C 38 C 2 20 C 22 C 36 C 3 20 C 22 C 34 C 4 20 C 22 C 32 C Installation The cover for the screw is removed and rear front is installed The terminal block is r...

Page 33: ...t but no hot water comes out of it Action Check if the mixing valve is defective remedy or replace Check if there is cold water supply if not check why and rectify the fault The safety valve leaks Act...

Page 34: ...order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed All trademarks in this material are property of the respective companies...

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Danfoss Heat Pump, Troubleshooting Manual

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