Danfoss Heat Pump Troubleshooting Guide download pdf (Page 17)

VMIFB202

Phase drop

Action:

Check that there is 230 V between incoming L2 on the circuit board and neutral on block 220.

Check if the overheating protection has tripped.

Check if any cables at the circuit board or overheating protection are loose or damaged.

Check that the thin, gas lled wire to the bulb is intact.

The overheat protection has tripped

Action:

Check if the overheat protection (T1) has tripped by pressing the red button until clicks.

The overheat protection breaks all input phases to the electric heating element.

If the overheat protection cannot be reset and the alarm remains, replace the overheat protection

No or insucient circulation in the heating system

Action:

Check that the circulation pump rotates or if the circulation pump 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 o valves are open, if not open all closed valves and taps

Check that the strainer is not blocked, clean if necessary

Check that there is no air in the heating system, bleed any air according to the installation instructions

Check that the supply sensor displays the correct value, see ohm table

Check that the return sensor displays the correct value, see ohm table

If both the HP and AH have deployed it is likely that there is a ow problem!

The submersible tube in the electric heating element is against the coils

Action:

Check what the ow temperature is when the overheating protection trips. This normally trips at 95°C.

The submersible tube can be withdrawn a few centimetres if the tube is too close to the coils in the heating element.

Troubleshooting Guide Alarm Aux. heater

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Danfoss Heat Pump Troubleshooting Guide Page 17