Table 4-2. UNIT TROUBLESHOOTING - continued.
IMPROPER/NO SPARK IN IGNITER.
A straight blue spark inside the burner must be present in all modes (VENT, AUTO, MANUAL) of
heater operation to have combustion. Troubleshoot ignition system if spark is not visible or
Electrical high voltage cannot be seen, but it can kill you. It is unlike other dangerous things you
come in contact with because it gives no warning or symptoms to be wary of. Its effect is
immediate. It can kill , render you unconscious, or severely burn you. To ensure your safety and
other maintenance personnel, always observe the following precautions:
DO NOT perform maintenance on electrical equipment unless all power is removed.
BE CERTAIN there is someone assisting you who can remove power immediately.
ALWAYS place POWER OFF warning tags on power supply switches so that no one will
apply power while you are performing maintenance.
FOR ARTIFICIAL RESPIRATION, REFER TO FM 21-11.