Spheros thermo 231, Workshop Manual

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5 Troubleshooting Thermo 230 / 231 / 300 / 301 / 350
508
5.3.2.8 Fault Symptom "Temperature Limiter
Defective"
Is electrical power supply
to components o.k.?
YES
NO
Has temperature limiter responded?
(Reset according to type of temperature limiter)
Determine why temperature limiter has responded,
e.g.:
• check shut-off elements,
• check water circulation in system is free from
bubbles,
• check circulation pump sense of rotation,
• check coolant low temperature resistance.
Can no fault be detected?
Make electrical connections.
Control unit defective, replace.
Replace temperature limiter.
If symptom shows again after testing:
control unit defective, replace.