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With the power off, you can check the continuity through the surge protector. Place a meter lead on the
top pin #1 of the surge protector and pin #3 on the bottom of the surge protector. Check across the top
pin #3 and the bottom pin #1. If you read continuity across these two points, the surge protector is good.
If you do not get continuity, replace the surge protector.
Table 24. Remote Controls.
Wire Color Voltage Resistance
Connector
No.
Pin
Nos.
Terminals A1 10-13 VDC 1.5-3.0k ohms A 1-3
Frost Protection:
This unit has frost protection heaters mounted at different points to protect the water the water heater
from freezing. The heaters located on the hot water outlet line should have a resistance reading of 10-20
ohms through each of these heaters. The heater located on the heat exchanger piping should have a
resistance reading of 35-50 ohms, and the one located in the water flow sensor valve, hot water outlet,
and drain connection should have a resistance reading of 110-150 ohms. The heater located on the
latent heat exchanger should have a resistance reading 90-110 ohms.
Amp Fuses:
This unit has one inline seven-amp glass fuses. Remove the fuse and check continuity through it. If you
have continuity through the fuse, it is good. Otherwise, the fuse is blown and must be replaced.