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I expect you've probably got this fixed by now? In my experience people who own these machines want them working all the time. This error code problem can be over concentrated or under concentrated developer. Possibly needs developer changing, or the DEV sensor could be U/S. Good luck.
That error means low temperature on the heat roller. The thermistor (something like an electric thermostat) measures the amount of heat needed to work. Error 173 refers a lower temperature than required, while error 172 refers overheat. The complete error list will be of no use to you, since most errors will refer you to an authorized service center.