Viessmann Vitotronic SPS Service Instructions Manual page 48

Troubleshooting
Overview of fault messages
TID Pp. No. Fault message
55 "Alarm, flow weak, evapo-
rator"
56 15 "No flow in groundwater
circuit"
57 "PLC"
58 "Dry cooler (209)"
59 5 "Evaporator pump"
60 "Flow temperature too low
circuit 1"
61 "Flow temperature too low
circuit 2"
62 "Flow temperature too low
circuit 3"
63 "! ! ! Emr_off_actv ! ! !"
70 "Low press. (transmitter)"
48
(cont.)
Effect
The heat pump is switched
off
The heat pump is switched
off
Possible faulty control char-
acteristics in the heat pump
control unit
The heat pump cannot dissi-
pate its heat sufficiently in ac-
tive cooling mode. This cau-
ses high pressure or super-
heating faults.
Evaporator pump and heat
pump switch off
The heating circuit pump for
heating circuit 1 is switched
off
The heating circuit pump for
heating circuit 2 is switched
off
The heating circuit pump for
heating circuit 3 is switched
off
The heat pump is switched
off
All compressors are switched
off
Cause
Flow rate through evaporator
too low, ΔT inlet/outlet > 10 K.
Evaporator contaminated
■
Circulation pump faulty
■
A shut-off damper is closed
■
Flow rate through system sep-
arator too low
System separator contami-
■
nated
Filter contaminated
■
Well pump faulty
■
A shut-off damper is closed
■
Groundwater level too low
■
A control unit problem has oc-
curred
Fan, control unit or speed
■
controller of re-cooler faulty
Re-cooler contaminated
■
Contactor for evaporator
■
pump is not functioning
Frost protection switch has
■
responded
Safety high pressure switch
■
has responded
The control unit is not func-
tioning correctly for cooling.
The set minimum value has
been undershot.
The control unit is not func-
tioning correctly for cooling.
The set minimum value has
been undershot.
The control unit is not func-
tioning correctly for cooling.
The set minimum value has
been undershot.
The external emergency stop
button has been operated.
To acknowledge:
Reset the switch and then ac-
knowledge in the alarm list.
Pressure on the low pressure
side has fallen below the mini-
mum permissible level.
No pressure could be built up.
Circulation pump faulty or
■
flow rate too low
No circulation through evap-
■
orator
Expansion valve faulty
■
Too little refrigerant in refrig-
■
erant circuit