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Faulty function in 4-way valve
Possible cause 1: Four-way valve does not work properly.
Action: 1. Select Acknowledge.
2. Contact your dealer at repeated alarms.
T6 High hot gas temperature
Possible cause 1: The working temperature of the compressor is too
high.
Action: 1. Select Acknowledge.
2. Contact your dealer at repeated alarms.
Possible cause 2: Intermittent temperature rise due to abnormal
operating conditions.
Action: 1. Select Acknowledge.
2. Wait and see. Contact your dealer at repeated alarms.
Fault on electric additional heat (290 A/W, electric cassette)
Possible cause 1: Additional heat overheat protection has tripped.
Action: 1. Select Acknowledge.
2. Reset the overheat protection on the additional heat.
3. Contact your dealer at repeated alarms.
Fault on additional heat for heating system
(electric/oil-fi red boiler)
Possible cause 1: Additional heater overheat protection has tripped.
Action: 1. Select Acknowledge.
2. Reset the overheat protection on the additional heat.
3. Contact your dealer at repeated alarms.
T8 High fl ow temperature
There is a sensor, T8, in the heat pump, which for reasons of safety, stops the
compressor if the fl ow temperature becomes higher than the set value.
Possible cause 1: Not enough fl ow over the heat pump.
Action: 1. Check that the heat carrier pump has not jammed (see
Tripped high pressure switch).
2. Check that all the valves are open. In heating systems
with thermostat valves these should be fully open and
in underfl oor heating systems at least half of the coils
should be fully open.
Possible cause 2: Particle fi lter is clogged.
Action: 1. Clean the particle fi lter, see Maintenance.
What to do if a fault occurs