Stationary heater/heater booster control unit, location/task - GF83.70-P-4002A

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MODEL 168 with ENGINE 668.940 with heater booster

MODEL 202 with ENGINE 611.960 with heater booster

MODEL 210 with heater booster

MODEL 220 with ENGINE 613.960 with heater booster

MODEL 220 with ENGINE 628.960 with heater booster

MODEL 129 as of 1.6.97 with CODE (228) Stationary heater

MODEL 203 up to 23.4.04, models 210, 215, 220, 230 with CODE (228) Stationary heater

MODEL 463 as of 1.6.94 with CODE (H12) Auxiliary heater Webasto Tele Thermo Top S

MODEL 209.3 up to 31.5.04 with CODE (228) Stationary heater

Models 129, 168, 202, 203, 209.3, 215, 220, 230

Fig 1: Identifying Heat Exchanger, Burner Housing And Control Unit

Courtesy of MERCEDES-BENZ USA

Stationary heater/heater booster control unit position	The STH control unit (A6n1) or STH or HB control unit (A6n1) is located at the STH heater unit in models 129, 203, 230, 209.3 or the STH or HB heater unit in models 168, 202, 220. It forms an inseparable unit together with the heat exchanger (1).
Stationary heater/heater booster control unit position	Model 210 up to 31.08.96 with engine 602.982 with heater booster Model 210 with code (228) Stationary heater Model 463 as of 01.06.94 with code (H12) Webasto Tele Thermo Top S auxiliary heater	GF83.70-P-4002-01A
Stationary heater/heater booster control unit, task		GF83.70-P-4002-02A