Troubleshooting Messages; Red Led On The Heat Pump Control Unit; Messages On The Programming Unit; Acknowledging Messages - Viessmann VITOCAL 060-A Installation And Service Instructions Manual

Troubleshooting
Messages

Red LED on the heat pump control unit

Fig. 24
Red LED
A
Signal Cause
Flashes briefly No fault
every 10 s.
Flashes in a dif- Fault
ferent se-
quence.
Constantly off No power supply

Messages on the programming unit

Message Cause
"ER 1" Safety high pressure switch has responded.
Overpressure in the heat pump circuit.
"ER 2" High limit safety cut-out has responded.
Overheating of the DHW cylinder.
"ER 3" Short circuit/lead break in lower cylinder temper-
ature sensor
"ER 4" Short circuit/lead break in air intake temperature
sensor
"ER 5" Short circuit/lead break in evaporator tempera-
ture sensor
"ER 8" Communication problem between programming
unit and heat pump control unit

Acknowledging messages

Press and hold and OK simultaneously for 3 s to
clear a message and resume standard operation.
32
Action
No action required
See message on the programming unit
Restore power supply.
Action
Switch power supply OFF and ON again.
or
Acknowledge message. See the following
chapter.
Ensure DHW is being drawn.
Reset high limit safety cut-out (see
page 34).
Check resistance value and replace sensor
if necessary (see page 36).
Check connections and cables.