Panasonic S-80MW1E5 Service Manual & Test Run Service Manual page 26

16. Troubleshooting Guide
Alarm code
Alarm meaning
Alarm conditions
2
Possible Cause
Check
Other check points
Even though set temperature is 45˚C or more, the water temperature does exceed 45˚C or more.
There is the possibility that the internal heater has not worked properly. Check below items.
Disconnection of heater ⇒ Measure the resistance.
Disconnection of connector ⇒ Check
Overload protector is active ⇒ Check the OLP state.
Icon
External Device Notice
(f and b) and c or a and (d or e)
a: External Device use Setting is not "00".
b: Input the external Device Notice（terminal OPEN）
c: Continues for 60 seconds.
d: Abnormal internal heater state.
e: Overload protector of internal heater is active (P07)
f: External Device use setting is "01".
In case that signal of external Device Notice is input, Air-to-Water module can operate
continuously.
Signal of External Device Notice is input.
Check the external device.
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Air-to-Water Indoor Unit