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VHX SERIES STEAMER - TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES
F24700 (October 2001)
Page 64 of 68
Boiler Slow to Pressurize
(over 15 min. to achieve operating
pressure)
1. Low water supply pressure, inline water strainer clogged or fill
solenoid valve malfunction. See "INLINE WATER STRAINER
CLEANING" and "FILL AND COLD WATER SOLENOID
VALVES" in "SERVICE PROCEDURES AND
ADJUSTMENTS".
2. Boiler blowdown solenoid valve clogged and not fully closing.
Check for a slow leak out of steamer drain. If not able to verify,
then proceed to step 3. If blowdown solenoid valve appears to
be functioning properly, then proceed to step 4.
3. Turn power switch OFF, disconnect lead wires from blowdown
solenoid and remove it for inspection.
4. A heavy build-up of scalants has coated the interior of the
boiler, creating an insulating effect. Examine interior of boiler
as outlined under “BOILER” in "SERVICE PROCEDURES AND
ADJUSTMENTS".
5. Low incoming gas pressure is reducing BTU output.
A. Verify gas supply line to the steamer is a minimum of one
inch diameter (ID).
B. Check incoming line and manifold gas pressures as
outlined in "GAS MANIFOLD PRESSURE ADJUSTMENT"
under "SERVICE PROCEDURES AND ADJUSTMENTS".
6. Gas valve malfunction.
A. Check incoming line and manifold gas pressures as
outlined in "GAS MANIFOLD PRESSURE ADJUSTMENT
under "SERVICE PROCEDURES AND ADJUSTMENTS".
Boiler will not heat or build pressure. 1. Gas not on.
2. Power/reset switch assembly malfunction.
3. Boiler not filling - check fill solenoid for power, clogging or
malfunction.
4. Gas pilot and/or gas manifold pressure low. See "GAS PILOT
PRESSURE ADJUSTMENT" and "GAS MANIFOLD
PRESSURE ADJUSTMENT" in "SERVICE PROCEDURES
AND ADJUSTMENTS".
5. Cycling pressure switch open or set too high. Steamer is
cycling on high limit.
6. High limit pressure switch open and not re-setting
(malfunction).
7. Water too "pure" for probes to properly conduct electricity.
NOTE:
Items 8 & 9 see "WATER LEVEL CONTROLS TEST"
in "SERVICE PROCEDURES AND ADJUSTMENTS".
8. Water Level Control malfunction.
9. Aux. Water Level Control malfunction.
Pressure relief valve(s) opening or
leaking.
1. Pressure overshoot on initial startup or long burner on times
under heavy usage.
2. Pressure relief valve malfunction.
3. Cycling pressure switch set to high.
4. High limit pressure switch not set correctly or malfunctioning.