WATER HEATER DOES NOT HEAT WATER (CONT).

c. Check for 24 vdc between HEATER ON/PURGE ON switch (S4), terminals 1, 2, and 5, and ground.

(1) If voltage is indicated at terminal 2 but not at 1 or 5, replace switch.

(2) If voltage is indicated at terminals 2 and 1 but not 5, notify intermediate direct support maintenance to

repair jumper wire.

(3) If no voltage is indicated at 1, 2, and 5, disconnect wires from flame switch (S2) (6) and measure

across contacts for continuity. If infinity is indicated, replace S2 switch.

TM 3-4230-209-20&P

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