A: Could you please try the following steps:
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loosen screws on the back of ITC-308 a little, then unplug the ITC-308
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press the ‘set’ button (don’ t loosen it till power up)
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plug the ITC-308
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It will enter test mode, please press ‘up’ or ‘down’ button, the heating and cooling lights will alternately lit and extinguish.
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unplug and re-plug the ITC-308 (do not need to press ‘set’ button), it will enter normal mode.