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VHX SERIES STEAMER - TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES
F24700 (October 2001)
Page 63 of 68
Gas odor. 1. Leaks in pipe fitting connections or components.
2. Leaking pressure tap plug on pilot or main gas valve; loose or
missing pressure adjustment screw cap on main gas valve.
3. Leaking gaskets in air/gas mixture path.
4. Pilot or main gas valve malfunction (improper venting or vent
blocked).
5. Incorrect gas pressure.
6. Malfunctioning gas burner.
7. Blocked or dirty air orifice on blower.
8. Blocked or dirty gas orifice.
9. Malfunctioning blower.
10. No pilot ignition.
11. Improper hood venting, vent blocked or room not vented
properly.
Drain box leaking. 1. Clog in drain line plumbing.
2. Drain restricted to size below 1-1/4" pipe.
3. Drain extension plumbing not at the proper slope or plumbing
too lengthy.
4. Grommets not sealing.
5. Steamer draining while under pressure and relief valve opening
at the same time (flooding drain box).
6. Cold water condensing spray is "over spraying".
7. Drain box thermostat improperly set or malfunctioning.
Cold water condenser not operating
properly.
1. Water supply valves(s) turned off.
2. Cold water condenser solenoid not receiving power, inoperative
or valve plugged.
3. Cold water condenser thermostat malfunction or needs
adjustment.
4. Plugged spray nozzle.
5. Water supply pressure high (improper valve operation).
Heat coming on without water in boiler
(Dry firing).
1. Lime scale build-up on water level probes (shorted to ground).
2. Retention of water in probe housing (assembly or aux.LLCO).
3. Water level control malfunction.
4. Aux. water level control malfunction.
Spark Ignitor not sparking. 1. Ignitor boot on ignition cable loose, damaged or missing
causing excessive ignition voltage leakage.
2. Loose, broken or damaged lead wires (including ground) from
ignition module to ignitor.
3. Poor ground on ignitor assembly.
NOTE
: Items 4, 5 & 7 see "IGNITION CONTROL MODULE
CHECKS" in "SERVICE PROCEDURES AND
ADJUSTMENTS".
4. Ignition module not receiving power.
5. Ignition module malfunction (no output voltages or spark).
6. Ceramic flame rod insulator on ignitor cracked or damaged
from extreme heat.
7. Incorrect spark gap setting.