Danfoss DHP-AT, Installation Manual

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10 Troubleshooting
10.1 Operational problems
Operational problems can be solved by troubleshooting the following areas:
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Alarms
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Leakage (fluid side)
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Abnormal noise in the heat pump or radiator system
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Hot water
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Heating
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Other issues
There may be more than one way of troubleshooting a cause.
10.1.1 Alarms
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
22 Cooling coil sensor (T6) failure
23 Exceeded operation range warning (non-fault)
Installation Guide DHP-AT
VMGFI302 Danfoss Heating Solutions
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