37
Message
Cause
Measure
"ER 8"
Communication problem between programming
unit and heat pump control unit
Check connections and leads.
"ER 9"
DHW heating takes unusually long
Check heat pump and immersion heater;
check for leaks.
"ER 10"
No changeover between premium and economy
tariff during past 24 hours
Check input for premium/economy tariff (see
page 43).
Acknowledging messages
Press and hold
and
OK
simultaneously for 3 s to
clear a message and resume standard operation.
Troubleshooting
Messages
(cont.)
6136003
Diagnosis
