Intertek MES80 Installation Instructions Manual page 32

Troubleshooting Chart
• Integrated
control module
☼
LED has THREE
3 Rapid
(3) GREEN rapid
Flashes
flashes.
GREEN
• Abnormal high
pitch noise during
burner operation.
☼
1 Flash
GREEN
• ID plug installed • N/A
• Abnormal combustion • Insufficient combustion air or
noise during heating. high input.
· Blocked flue and/or air inlet
pipe, or faulty induced draft
blower or pressure sensor.
• For control with unit-specific
programming imbedded in
the CPU, this indicates at
power-up that a valid ID plug
has been installed and the
control will use the alternate
parameters.
• Check and correct gas
supply and manifold
pressures.
• Replace bad gas valve or
gas orifice size.
• Check flue and air
inlet piping for blockage,
proper length, elbows, and
termination.
• Check induced draft blower
and pressure sensor for
proper performance.
32
CONTROL BOARDS
• Turn power and gas
OFF prior to repair.
• See "Vent/Flue
Pipe" section for
piping details.
• Replace induced
draft blower or
pressure sensor with
proper replacement
part.