Specifications

Armstrong International
IOM-706
Flo-Direct Water Heater
Page 32 of 45
Troubleshooting Table
Troubleshooting
Note: Turn off power to heater prior to beginning. During troubleshooting, turn it on only when and only for as long as
required for specific steps below.
Troubleshooting
Problem Probable Cause Correction
Actuator Fault
Transitory alarm or to confirm fault Turn "AUTO/OFF/MANUAL" switch to "OFF" then to
"AUTO" (or "MANUAL" if using that mode).
Start attempt without actuator in low fire
position
Confirm that switch on burner arm is in contact and
closed.
Heater with modulating burner not in
"MANUAL" state at start-up attempt
Press "ACTUATOR RESET" on control panel if it exists.
OR
Unplug and replug "d-out" relay in control panel.
Flame Safety Fault
Transitory alarm or to confirm fault Press reset button twice on Veri-Flame controller inside
control panel (button must be out). If fault recurs,
continue.
Flame failure Check spark rod wiring and connection for breaks,
arcing, or carbon fouling.
Check UV scanner for dirt and reaction to flame.
Air failure Check air flow switch:
• Disconnection
• Plugged sensor tube
• Defective
Check blower overloads:
• Electric current setting. Adjust or reset.
• If fault recurs, check 3-phase wiring.
• If fault persists, check blower motor coil impedance.
System error Check adjustment of POC switch.
Check gas valve for proper operation.
Low Gas Pressure
Transitory alarm or to confirm fault Press red reset button on low gas pressure switch on
fuel train.
Upstream fuel valve closed Open all upstream valves.
Defective pressure regulator spring Replace spring.
Defective pressure regulator Replace regulator.
High Gas Pressure
Transitory alarm or to confirm fault Press red reset button on high gas pressure switch on
fuel train.
Regulator pressure set too high Turn regulator adjustment screw CCW to reduce
pressure.
Defective pressure regulator spring Replace spring.
Defective pressure regulator Replace regulator.
Troubleshooting Table