Explanation Of The Alarms; Overview Of Fault Messages - Viessmann Vitotronic SPS Service Instructions Manual

Explanation of the alarms

■ The system is no longer in standard mode. The fault
should be remedied without delay.
The central fault message connection is activated.
■
■ Messaging via a communication facility (website or
Modbus) is possible.

Overview of fault messages

Note
You may acknowledge the following fault messages at
any time.
TID Pp. No. Fault message
1 "Replace PLC battery!"
3 "Expansion valve heat
pump"
5 "Frost risk in cold water
circuit"
6 "Frost risk in heat pump
evaporator"
7 "Frost risk in heat pump
evaporator"
8 52 "Sensor outside measuring
range"
9 101 "Sensor outside measuring
range"
10 201 "Sensor outside measuring
range"
Effect
Limited or no heat pump
function. A prolonged power
failure could cause settings to
be lost or altered.
The heat pump remains off
No natural cooling
Charging the coolant buffer
cylinder is impossible.
The heat pump stops.
The heat pump remains off
Heating water buffer cylinder
is not charged.
The heating circuit pump for
heating circuit 1 remains off.
The heating circuit pump for
heating circuit 2 remains off.
Troubleshooting
Cause
The back-up battery is totally
or almost spent.
Problem with the superheating
control.
Electronic expansion valve
faulty or incorrectly adjusted.
The coolant charging circuit
for the coolant buffer cylinder
has reached its frost protec-
tion limit.
Coolant inlet too cold
■
Too little circulation (flow
■
rate) through the coolant
system separator
System separator contami-
■
nated
Primary outlet temperature of
the evaporator has reached its
frost protection limit.
Heat source too cold
■
Too little circulation (flow
■
rate) through the evaporator
Evaporator contaminated
■
Primary outlet temperature of
the evaporator has reached its
frost protection limit and tem-
perature still too low (< 2 °C).
Circulation pump faulty
■
A shut-off damper is closed
■
Heat source permanently
■
too cold
Buffer temperature sensor or
connecting lead faulty
Flow temperature sensor for
heating circuit 1 or connecting
lead faulty
Flow temperature sensor for
heating circuit 2 or connecting
lead faulty
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