Omega OTEC ERVD Series Service Manual page 8

6.2 Troubleshooting
T4 sensor error / T1 sensor error
Check whether the wiring of the temp. sensor is break off
Check whether the resistance of temp. sensor is wrong refer
to the Annex 1
Replace main controller panel
Check: whether the current reach 5A.
Check the main controller panel
Replace main controller panel
No
No
Current protection
No
Yes
Connect the wiring well
Yes
Replace temp. sensor
Yes
Turn off all motors, and
restart 3 minutes later.