Regular Checks; Checking Operation - Danfoss DHP-AT User Manual

User Guide
8

Regular checks

8.1

Checking operation

During normal operation, the alarm indicator is hidden to show that everything is OK. When an alarm is trig-
gered, the alarm indicator flashes and at the same time an error code is shown in the display.
Error code Description
00 Communication failure
01 Return water sensor (T9) failure
02 Supply water sensor (T8) failure
03 Water flow switch protection
04 Phase sequence error (only applies to 3-phase models)
05 Excessive temperature difference between supply and return water (>13°C)
06 Internal electrical heater overheat protection (>85°C)
07 Condenser overheat protection
08 Hot water tank sensor (T3) failure
09 Buffer tank sensor (T2) failure
10 High pressure protection
11 Low pressure protection
12 Supply water temperature too high
13 Supply water temperature too low (cooling mode only)
14 Return gas temperature sensor (T5) failure
15 Exhaust gas temperature sensor (T4) failure
16 Exhaust gas temperature overheat protection
17 Null
18 Frost protection, step 2 (non-fault)
19 Frost protection, step 1 (non-fault)
20 Air temperature sensor (T1) failure
21 Heating coil sensor (T7) failure
Danfoss Heating Solutions
DHP-AT
Check the alarm indicator regularly to
ensure that the appliance is working
correctly. In the event of an alarm the
heat pump will, if possible, supply heat-
ing to the house, primarily with the
compressor, secondarily with the inter-
nal electrical heater.
The hot water production will stop to
indicate that something noteworthy
has occurred.
VUGFC302
21