Troubleshooting - testo 555 Bedienungsanleitung

8. Troubleshooting

If faults occur which are not described here, please consult Testo customer service (see Customer
service, p. 24).
Fault
testo 555/556
The
does not react
After switching on
D D a a t t e e / / T T i i m m e e
a a d d j j u u s s t t ! ! appears
on the display
Cold capacity value
Heat capacity value
# # . . # # # #
If we were unable to answer your question, please contact your distributor or Testo
Customer Service. You will find contact details in the Warranty booklet or in Internet at
www.testo.com .
20
Possible causes
various
Power supply has
been accidentally
interrupted
-or-
The unit has
detected a system
error and rectified it
No refrigerant
selected
-or-
same pressures
Remedy
1 Remove the battery/rechargeable battery from the unit and
replace after approx. 30 sec.
2 Readjust date/time and other settings (refrigerant,
pressure type, ...).
Readjust date/time and other settings (refrigerant,
pressure type, ...).
Select refrigerant
-or-
Check pressure connections and valve paths and watch out for
difference in pressure between the connections.