Trianco TRISTAR OPTIMA JUNIOR K CB, Installation Instructions Manual, Page: 40 / 44

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After an appliance malfunction, the boiler will enter a lock-out state (indicated by the illumination of LED ‘ H ’). The
multifunction display will show a three-digit fault code. In most cases, the fault can be eliminated by switching the
boiler off then on, using
ON/OFF button ‘ A ’. An attempt can also be made to reset the operation by holding reset
button ‘ D ’ for two seconds. The boiler will perform a self-diagnostic cycle and restart if the problem has been
eliminated. If the problem persists, refer to the following fault-code chart:
If in doubt, fully-trained Trianco technical operatives are available to help you with any on-site need. For technical
advice, call 0114 257 2300 (Monday-Thursday: 08:30 – 16:45, Friday: 08:30 – 14:30).
13.1 FAULT CODES