PAGE 18 of 61 HO-7-1237 & HO-4-1234 OIL-FIRED HEATERS
© SAMUEL JACKSON, INCORPORATED 2003 ALL RIGHTS RESERVED
ERROR 457 (DUAL-FUEL MODEL)
GAS LOW PRESSURE:
The gas pressure is constantly monitored by the pressure switch
in the lower cabinet. This ERROR is triggered when the pressure is below 1-1/2 PSI
when the gas valves are open. Check for a closed gas cock or ball valve in the gas line to
the heater. For propane systems, check for malfunction of the vaporizer.
ERROR 458 (DUAL-FUEL MODEL)
GAS VALVE LEAK, UPSTREAM:
This is a serious ERROR caused by a leak in the
SSOV1 valve (SSOV1 is the "upstream" gas valve). The leak is usually caused by dirt or
other contaminants on the rubber seat of the valve. The test program may be run to
determine the severity of the leak. Refer to
DUAL-FUEL TEST SEQUENCE
EXPLANATION
for details. If severe contact the factory for service.
ERROR 459 (DUAL-FUEL MODEL)
GAS VALVE LEAK, DOWNSTREAM:
This ERROR is caused by a leak in either the Pilot
Gas Valve PV or the second Safety Shut Off Valve SSOV2. These are the "downstream"
gas valves. The leak is usually caused by dirt or other contaminants on the rubber seat of
the valve. The test program may be run to determine the severity of the leak. Refer to
DUAL FUEL TEST SEQUENCE EXPLANATION
for details. Contact the factory if the
leak is severe.
ERROR 460 (DUAL-FUEL MODEL) *
GAS LOW PRESSURE SWITCH IS NOT WORKING:
The Gas Low Pressure Switch
GLPS is not responding as it should in normal operation. The PLC performs an
automatic check of most of the heater’s switches and safety devices each time the burner
is started. One of these checks is the Gas Low-Pressure Switch (GLPS). If this switch is
closed when it should be open, the PLC will not permit the burner to start. Possible
causes of this abnormal operatio n of GLPS are: (1) SSOV1 is malfunctioning and is
open, maintaining gas pressure on GLPS at all times. (2) The GLPS switch is out of
adjustment. GLPS should close above 1.5 PSI. (3) GLPS has been tampered with or
bypassed electrically. If the operator is aware of the safety issues involved in bypassing
the function of this switch, a software bypass code is described in the footnote for this
section to permit emergency operation.
ERROR 461 (DUAL-FUEL MODEL)
GAS HIGH PRESSURE:
This ERROR occurs when the gas pressure is above 8 PSI
(excessively high) after the regulator. Adjust the regulator so that the pressure after the
regulator is between 3 and 5 PSI. Contamination in the gas pressure regulator (or a failed
gas pressure regulator) can cause this error.
