WATER HEATER DOES NOT HEAT WATER

WATER HEATER

1. WATER HEATER DOES NOT HEAT WATER

Step 1. 24 vdc is not available from pump unit.

Troubleshoot pump unit. See malfunction 5,

Step 2. Check for defective thermostatic switch S1

using the following procedures:

a. Remove TD2 tube from its socket.

Check from TD2 socket, hole 7, to switch

S4-1. If continuity is not indicated, thermo-

static switch S1 in top of the boiler is bad.

Reinstall TD2 tube (para 2-33).

Replace thermostatic switch S1 (para 2-33).

2-5

TM 3-4230-209-30&P