EAS ELECTRIC EMCH Serie Manual De Instalación Y Manual De Usuario página 188

18.5.14 Pb
Pb: Anti-frozen protection
Detect actual temperature of inlet water or plate type
heat exchanger: the detected temperature is lower
than 3℃ in cooling mode or detected temperature is
lower than 5℃ in heating mode and standby.
Check whether temperature sensor of water inlet pipe
or plate type heat exchanger is not effectively
connected or damaged
No
No
PCB is damaged
Replace PCB
Yes Its normal system protection,
the system will resume when
temperature go up
Yes
Replace or reconnect
temperature sensor
V.2
93