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16. Fault finding
16.1 Warning and trip codes
17. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
MP 204 display A 32
A = Trip
E = Warning
Fault code
Fault code Trip Warning Cause of trip/warning
2 A – Missing phase
3 A – PTC/thermal switch
4 A – Too many automatic restarts per 24 hours
9 A – Wrong phase sequence
12 – E Service warning
15 A – Communication alarm for main system
18 A – Commanded trip (not in alarm log)
20 A E Low insulation resistance
21 – E Too many starts per hour
26 – E The motor is operating even if the MP 204 is tripped
32 A E Overvoltage
40 A E Undervoltage
48 A E Overload
56 A E Underload
64 A E Overtemperature, Tempcon measurement
71 A E Overtemperature, Pt100/Pt1000 measurement
91 – E Signal fault, Tempcon sensor
111 A E Current unbalance
112 A E Cos ϕ, max.
113 A E Cos ϕ, min.
120 A – Auxiliary winding fault
123 A E Starting capacitor, low
124 A E Run capacitor, low
175 – E Signal fault, Pt100/Pt1000 sensor
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