is there alternative sensor

[_H2o_]

is there any alternative sensors for TK SL400 for return air ?

Alarm codes :
- 3
- 11
- 203

What sensors should i change TK missing turning off +/- 7*C what should i do ?


Thanx !

[gravy258]

depends, a SL400e SR2 has control and display return air,
a SL400 doesn't.
Is the temperature on the screen (the return air) jumping around or is it dashes ( -----) ?
If its jumping around, clean the micro plugs with electrical parts cleaner. (just the two lower plugs).
If its dashes replace the sensor and enter the new grade into the micro.