HTW A60CGN8PLUS Manuel De L'utilisateur page 146

ERROR MALFUNCTION
CODE OR PROTECTION
Three times "PP"
protection and
7℃
Buffer tank up
temp.sensor(Tbt1) fault
Solar
temp.sensor(Tsolar) fault
Buffer tank low
temp.sensor(Tbt2) fault
Communication error
between main board and
thermostat transferboard
In winter, if the unit has E0 and Hb failure and the unit is not repaired in time, the water pump and pipeline system
may be damaged by freezing, so E0 and Hb failure must be repaired in time.
The same to "PP".
Tw_out＜
"1.Check the resistance of the sensor.
2.The Tbt1 sensor connector is loosen,reconnect it.
3.The Tbt1 sensor connector is wet or there is water in,remove
the water ,make the connector dry.Add waterproof adhesive.
4.The Tbt1 sensor failure,change a new sensor."
"1.Check the resistance of the sensor.
2.The Tsolar sensor connector is loosen,reconnect it.
3.The Tsolar sensor connector is wet or there is water
in,remove the water ,make the connector dry.Add waterproof
adhesive.
4.The Tsolar sensor failure,change a new sensor."
"1.Check the resistance of the sensor.
2.The Tbt12 sensor connector is loosen,reconnect it.
3.The Tbt2 sensor connector is wet or there is water in,remove
the water ,make the connector dry.Add waterproof adhesive.
4.The Tbt2 sensor failure,change a new sensor."
RT/Ta PCB is set to be valid on user interface but the
thermostat transfer board is not connected or the
communication between thermostat transfer board and
main board is not effectively connected. If the thermostat
transfer board is not needed，set the RT/Ta PCB to invalid.
If the thermostat transfer board is needed，please connect
it to the main board and make sure the communication wire
is connected well and there is no strong electricity or strong
magnetic interference.
CAUTION
65
FAILURE CAUSE
AND CORRECTIVE ACTION