13
INSTALLATION AND OPERATION INSTRUCTIONS
IBC INDIRECT WATER HEATERS - ALL MODELS
SYMPTOM
DIAGNOSIS
REMEDY
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 boiler green terminal strip has
power (120V) to the lower 2 terminals P/VL
and P/VN
• Check wiring connections at the circulator
• Measure voltage at the circulator during a
call for heat, should see /- 12VAC
• 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.
• If the zone valve is connected to the P/V
terminals on the IBC boiler, ensure 24VAC
has been applied to the P/VL and P/
VN terminals on the bottom of the green
terminal strip and in the Installer Menu the
Load Control has been set to 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
Ohm’s 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
