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Residen al Hybrid Electric Heat Pump Water Heater Use and Care Guide • 23
PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION
“Water Heater Sounds” on page
26
1. Normal expansion and contraction of
metal parts during periods of heat-up
and cool-down.
2. Sediment buildup on or around the
elements.
3. The heat pump compressor or fan
running.
• No action required.
• Drain and flush the tank as directed under
the “Draining and Flushing” section (page
28).
• No action required.
“Drips from T&P Relief Valve
Discharge Pipe” on page 25
1. Excessive water pressure
2. Add or service a thermal expansion
tank.
3. Non-functioning Temperature &
Pressure Relief Valve
4. Debris under valve seat.
1. Check water supply inlet pressure. If higher
than 80 PSIG, install a pressure reducing
valve.
2. See “Water Pressure Increase Caused by Ther-
mal Expansion” section (page 7).
3. Replace the Temperature & Pressure Relief
Valve
4. See “Drips from T&P Relief Valve Discharge
Pipe” on page 25).
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