Service manual

SECTION 12: TROUBLESHOOTING
45
SECTION 12: TROUBLESHOOTING
12.1 Honeywell SmartValve
®
II Troubleshooting
This heater is supplied with the Honeywell Smart-
Valve
®
II control system. This system is equipped with
a diagnostic function that will assist in performing
troubleshooting. The LED (Light Emitting Diode) indi-
cator at the top of the SmartValve
®
II control will flash
in various patterns to indicate status. The LED status
indication chart provided below gives a summary of
possible faults.
LED Status Indicates
Off No power to the control.
Bright-Dim Normal Operation. This indication
shows whenever the system is pow-
ered, unless some abnormal event
has occurred.
2 Flashes Pressure switch remains closed
longer than 30 seconds after a call for
heat begins (pressure switch stuck
closed). The SmartValve
®
II checks
the status of the pressure switch con-
tacts and must see a change in the
contact with every firing cycle. Placing
a jumper at the switch out of
sequence will result in a fault, with the
LED indicator flashing 2 times.
3 Flashes Pressure switch remains open longer
than 30 seconds after combustion air
blower is energized. Check for correct
blower operation, blower intake
obstructions, pressure switch tubing
and wiring.
4 Flashes Limit string open, 2" white jumper wire
on valve is loose.
5 Flashes Flame signal sensed out of proper
sequence.
6 Flashes System Lockout. Flame sensing cir-
cuit is not functioning properly. Per-
form the checks following the "Does
the burner stay lit?" bubble in the trou-
bleshooting flow chart on Page 46,
Section 12.2.
Page 48, Section 12.3 will provide the information
needed to test the manifold gas pressure setting.
Page 46, Section 12.2 will guide you through several
troubleshooting steps to determine possible prob-
lems with the systems.
WARNING
Turn off gas and electrical supplies before performing
service or maintenance.
Failure to follow these instructions can result in
death, injury or property damage.
WARNING
Electrical Shock Hazard
Do not disconnect ground leads
inside heater.
Do not interchange grounded and
ungrounded leads on transformer or
ignition module.
Failure t
o follow these instructions
can result in death or electrical shock.