Convotherm OEB Series Service Handbook page 33

Service Handbook OEB/OES/OGB/OGS

The capillary probe with safety thermostat B7.2 (only in OGB):
switches the gas valve in the automatic firing N21 3 off when a critical
temperautre in the steam generator is reached. Thereby the blowing burner
U2 is no longer supplied with gas and switches off. From STB B7.1 alone, no
error code is produced, the error is registered from the automatic firing and
sent to the controls. The capillary probe is in the steam generator slid into a
pipe above the burner chamber of the steam generator burner. (together with
the safety thermostat probe B8).
Check:

STB B7 is triggered: Oven is no longer warmed by convection – the fan is not
rotating and the steam generator heating doesn't become warm.

STB B7.1 is triggered: Error code "No GAS" on Control Display.

STB B7.2 is triggered: Error code "No GAS" on control Display.
Cross reference:

Service Handbook 5. Trouble shooting and Error Codes Electronic
AS/11-2011 2_04_03e_Electrical safety switches_b
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