FunctionOutput
Not usedEQ1-AA5-K4
Function check, circulation pumps
With forced control of the circulation pumps it is neces-
sary to check the supply (230 V AC) and the control
signal (0-10 V DC).
Heating medium pump (GP1)
LED PWM1 on Card AA2PVM1, X2:1-2Pump speed GP1
Not litapprox 0 V DC100 %
Half litapprox 5 V DC50 %
Litapprox 10 V DC0 %
Status heating medium pump's (GP1) LED
Repairers actionCauseActionPump statusLED Status
Pump vented for 10
minutes.
The installer must
therefore set the
pump function.
The pump is bledRapid flashing green
The pump starts when
the problem is solved.
Interference (the
pump works but has
stopped)
Flashing red/green
1.1.
Check voltage.The pump re-
ceives the incor-
rect voltage
(U<160V or
U>280V)
2.
Check the water
in the system and
clean if necessary.
3.
Check that no ex-
ternal flow affects
the pump.
2.
Pump motor over-
loaded due to dirt
in the system.
4.
Check the system
for leakage.
3.
The pump motor
is forced to too
high speed by the
external flow.
5.
Check relationship
water/ambient
temp.
4. 6.
Short-circuit in the
motor's winding
due to water leak.
Check that no ex-
ternal flow affects
the pump.
5.
Pump has over-
heated.
6.
The pump's direc-
tion of rotation is
affected due to
the external flow.
Check that the pump
moves freely.
Replace pump.
The pump is blocked.
Electronics or motor
defect
Reset pump.
Check LED-signal
Pump stopped
(blocked)
Flashing red
The pump has no
voltage
Pump unpoweredLED off
1.1.
Check electrical
connection.
The pump is not
connected to an
electrical socket.
2.
Check that the
pump runs.
2.
LED damaged.
3.3.
Replace pump.Damaged elec-
tronics.
55Chapter 6 | TroubleshootingNIBE™ VVM 320
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