You should not assume that the RAYCHEM H908 is defective. If the indicator light is off, the unit may have tripped on ground fault. If you press the reset button and the indicator light does not come back on, the cable or heat-shrink connection or end seal may have grounded and tripped the unit. If this is the case, the cable, H908-to-cable splice or end seal will have to be repaired. Any testing or repair work should be done by a qualified electrician. If the indicator light is on but the cable is not getting warm, there may be an open circuit in the H908-to-cable splice or the cable may have been damaged from moisture ingress at some point in time. A current reading should be made to see if the cable is producing any power at all. A WinterGard H311 cable should draw about .025 A/ft at 40F or 2.5A per 100 ft. The RAYCHEM WinterGard Plus or RAYCHEM WinterGard Wet heating cables will draw about .05 A/ft at 40F or 5A per 100 ft. At 0F, these cables will draw about twice as much current. If there is no measurable current draw, the cable may be completely dead or the H908-to-cable splice may be open and need repair. To test for this case, the heat-shrink splice should be opened and the H908 tested for voltage output. If no voltage is detected and the indicator light is on, it is defective. If there is a voltage present, the cable has been damaged and will need to be replaced.
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