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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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Troubleshooting
Caution: 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.
Problem
Probable Cause
Correction
Flame Safety Fault
Flame safety has faulted
Reference fault code to Siemens LMV3 manual
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.
High Temperature Fault
Contact Armstrong!
Do not operate heater!
Water pressure switch failed and "dry fire" start-up
attempted
Check water pressure. If correct, replace pressure switch. If not,
continue.
Nozzles clogged
Remove top plate and clean nozzles.
Tank Full Fault:
Pump not keeping up with
water production
Transfer pump inoperable
Check and repair or replace.
Downstream valves closed or restricted
Confirm that all downstream valves are fully open. Press "FAULT RESET"
on HMI.
Troubleshooting Table
