Temp. increase
°C / 2 minutes
1.5
1.0
0.5
minutes
2
4
Error 55 comes below this line (when the “temp grad” setting = 3 --> 0.5°/2 minutes during 5 periods)
TROUBLESHOOTING
Page 61
Service Manual TDR8 P Gas form 9124023 rev. 01/2022
ERROR 55 EXPLANATION
Note: 1. Measuring starts 5 minutes after beginning of a heating step.
2. Duration is 5 periods of 2 minutes.
3. Measuring stops at 150°C/302°F or when temp. in cabinet is < 30°C than the set temperature.
Necessary line currents:
TDR8 with neutral 3x 16A. Without neutral 3x 27A.
TDR5 with neutral 3x 8,5A. Without neutral 3x 14A.
Possible cause
Caused by
Explanation
Solution
Energy supply pro-
blem
Safety thermostat
Not adjusted to it’s maximum
Fully turn clock-wise (cw)
Broken thermostat.
Replace thermostat
Broken temperature sensor
Sensor gives a wrong value
Replace sensor
Wrong setting of “temp
grad” parameter
Default setting is 3, --> 0.5° per 2
minutes
Check setting
Too much loss of
energy
Inner door removed
Put inner door back in.
Put “tem grad”setting on
2 or 1.
Too much energy
absorption
Products are stuffed with a
very humid substance
Put “temp grad”setting on
2 or 1.
