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7.0 Troubleshooting
This section includes conditions that may occur in the water heater as well as various solutions.
Symptom
Diagnosis
Solution
No hot
water at
faucets
Boiler does
not operate
Ensure boiler power is on.
Ensure the boiler is programed for DHW and the water temperatures are
set properly
Check the tank temperature on the IBC screen, Open or Short + sensor
or wiring issue
Water Heater
Circulator
does not
operate
Follow steps for Boiler does not operate
Ensure the pump relay is closed and suppling power to the pump
Ensure the zone valve is open and the end switch is closed calling for
heat
Check wiring connections at the circulator
Measure voltage at the circulator during a call for heat, should see
120VAC
If power is at the circulator and connections are correct, replace
circulator
Water heater
zone valve
does not open
Follow steps for Boiler does not operate
Check for 24VAC at the zone valve while there is a call for heat, if
correct voltage is available and connections are good, replace the zone
valve.
Tank sensor
open, short, or
mis-wired
Ensure the tank sensor is connected to the correct terminals and the
wires are properly attached to the terminal strip and the sensor is
properly attached to the wiring at the tank
Disconnect the sensor wires from the terminal strip and measure the
resistance in Ohms across the 2 sensor wires. Compare this value to the
chart and the actual tank temperature. Repeat this test for the sensor
only and compare the results.
Check/replace the wire from the boiler to the sensor or replace the
sensor
Water at
faucets
too cool
DHW
temperature
setting too low
Increase the DHW Tank Set Point temperature
Summary of Contents for IWT 119
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