Armstrong International
IOM-706 V2.0
Flo-Direct Water Heater
Troubleshooting Table
Page 32 of 45
Troubleshooting
Troubleshooting Table
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.
