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H4-21 means: Sub heater lamp abnormally low temperature detection. The setup temperature (about -25°C: Sim 43-1-1) is not reached within the specified time (about 32sec) from turning on the power ON SW. (When the temperature falls below 140°C in the standby mode.) -Check the sub heater lamp blinking with SIM 5-2-2.
Hello sir; This error code require reset the procedure as follow;
press "#/p" " . " "clear" " . " then enter 16 press start enter 0 press start again, press "clear all" machine will back to normal.
Basicly there is not a trick to the S.P. mode. You go in to it & touch The S.P. on the display and then turn the main power switch off and then back on and that is that is needed. But if that did not work you will need to go deeper in to the problem.
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