15 Troubleshooting; Alarm List; Measurement Points - Danfoss DHP-H Installation And Service Instructions Manual

15 Troubleshooting

15.1

Alarm list

Shown in display in the event of an alarm. To reset alarms 1-5, set the operating mode to OFF or cut the power supply.
Message
HIGHPRESS ERROR
LOWPRESS ERROR
MOTOR P ERROR
BRINE OUT
BRINEFLOW LOW
ADD. HEAT
SENSOR OUTDOOR
SENSOR FRONT
SENSOR RETURN
SENSOR HOT WATER
SENSOR DEFROST
MS FAN
SENSOR COOLING
15.2

Measurement points

Conversion table for sensors
NOTE! When reading the resistance of the sensors, the sensor leads must first be disconnected from the control equipment.
Outdoor sensor
°C ohm, Ω
-30 1884
-25 1443
-20 1115
-15 868
-10 681
-5 538
0 428
5 343
10 276
15 224
20 183
25 150
30 124
35 103
40 86
Meaning
Tripped high pressure switch. Compressor stopped. No hot water production.
Tripped low pressure switch. Compressor stopped. No hot water production.
Deployed motor protection (Over current relay compressor). Compressor stopped. No hot
water production.
Brine out is less than the set minimum temperature. Compressor stopped. No hot water
production.
Flow sensor not active during last start. Compressor stopped. No hot water production.
Overheating protection deployed. No additional heat.
Fault in outside sensor. Zero degrees used for calculations.
Supply line sensor error. Everything stops except the heating system's circulation pump.
Return sensor fault. Return temperature = Supply line – 5 is used. Calculated supply tem-
perature limited to maximum 45°C.
Fault on sensor for start temperature. No hot water production.
Defrost sensor fault. Heat and hot water production is controlled from the outdoor sensor's
value instead. (Applies to DHP-A, -AL)
Deployed motor protection for outdoor unit fan. Compressor stopped. No hot water pro-
duction. (Applies to DHP-A, -AL)
Sensor fault. Cooling function stops.
Other sensors
°C kilo ohm, kΩ
0 66.3
5 52.4
10 41.8
15 33.5
20 27.1
25 22.0
30 18.0
35 14.8
40 12.2
45 10.1
50 8.5
55 7.1
60 6.0
65 5.0
70 4.2
75 3.7
80 3.1
85 2.7
90 2.3
95 2.0
1. Disconnect the sensor cable at the I/O card.
2. First measure the sensor including the cable.
3. Then measure the sensor only.
VMBMA602
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