Intellihot iN199, Installation & Operation Manual

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53 iN199 Wiring Diagrams and Troubleshooting
November 2021 - Revision 00
Description Possible Cause Remedy
Faulty Sensors
Inlet / Outlet Sensors • Faulty sensor wiring or
faulty sensor.
• Inlet water temperature sensor.
• Heat engine water outlet
temperature sensor.
• Faulty controller.
• Check for nicked or broken sensor wiring or connectors. Also
check for corroded or wet connectors.
• Measure resistance of sensor at connector (18 kΩ at 50°F,
10 kΩ at 77°F, 3 kΩ at 140°F).
• Replace controller.
Heat Exchanger
Outlet temperature exceeded set
limit
• Flow rate changes excessive.
• Faulty sensor wiring.
• Faulty sensor.
• Faulty controller. • Ensure the water flow rate does not change faster than 2
GPM every 5 seconds.
• Check for nicked or broken sensor wiring or connectors. Also
check for corroded or wet connectors.
• Measure resistance of sensor at connector (18 kΩ at 50°F,
10 kΩ at 77°F, 3 kΩ at 140°F).
• Replace controller.
Flue
Temperature Exceeded Set Limit • Incorrect vent set up.
• High inlet temperature.
• Faulty sensor wiring.
• Faulty sensor.
• Faulty controller. • If vent pipe material is CPVC or polypropylene, ensure that
CPVC is selected in the vent material screen.
• Ensure inlet temperature is lower than 150°F if vent pipe
material is PVC or lower than 190°F if vent pipe material is
CPVC or polypropylene.
• Check for nicked or broken sensor wiring and connectors.
Also check for corroded or wet connectors.
• Measure resistance of sensor at connector (18 kΩ at 50°F,
10 kΩ at 77°F, 3 kΩ at 140°F).
• Replace controller.
Blocked Flue Fault
• Exhaust blocked (bird, etc).
• Backed up condensate.
• Wiring loose (switch open). • Check exhaust termination. Check exhaust connection at
water heater. Install screens to prevent blockage.
• Check slope of drain. Check for double loops, air locks, or
debris in loop.
• Check wiring.