Roberts Gorden Vantage HEM-80 Installation, Operation & Service Manual page 70

HEM-S I , O
ERIES NSTALLATION PERATION AND
start pre-purge function or
H.S.I. warm-up.
GREEN, 2 flashes: Call for heat indicates the
heater is performing light off,
heater warm-up, or heater run.
GREEN, 3 flashes: *Only applicable for
thermostat control*
Gas ON - No call for heat, unit
modulating from single stage
thermostat.
AMBER, 1 flash: Call for heat when flame signal
is below 1µA
AMBER, 2 flashes: Gas ON - Call for heat when
flame signal is below 1µA
AMBER, 3 flashes: *Only applicable for
thermostat control*
Gas ON - No call for heat, unit
modulating from single stage
thermostat when flame signal
is below 1µA.
AMBER,
Fast Flashing: Heater is in RETRY mode.
RED Steady LED: Control FAILURE,
No 24 V power supply.
RED, 1 flash: Lockout- Insufficient sensed
air pressure when blower is
on.
Condition could be caused by:
• Air Side Door
• Blower
• Obstruction in
• Pressure hose fittings
• Pressure Switch
RED, 2 flashes: Lockout- Blower air pressure
reads above zero level when
blower is off.
Condition is caused by
a pressure sensor failure or
complete blockage of air
66 of 80
S M
ERVICE ANUAL
inlet or outlet
intake or exhaust vent.
RED, 3 flashes: Lockout- Flame is sensed on
when it should be off or off
when it should be on.
Could be caused by:
• Flame Rod
• H.S.I.
• Gas Supply
• 120 V Supply Polarity
• Board Fault
RED, 4 flashes: Lockout- Gas Valve.
Condition caused by main
valve on gas valve.
Check gas valve wiring.
RED, 5 flashes: Lockout- Board Failure.
Board must be replaced.
RED, 6 flashes: Not used.
RED, 7 flashes: Lockout- Fuse Open.
Condition could be caused by:
• Fuse blown
• High Limit Switch open a
RED, 8 flashes: Lockout- Pressure switch
failed to operate or modulation
current was incorrect.
Condition could be caused by:
• Pressure Sensor
• Pressure Switch
• Gas Valve Modulation Coil
• Wire Harness (6 wire)
RED, 9 flashes: Lockout- Air Supply.
Condition could be caused by:
• Blower
• Pneumatic Conections to
• Blockage in flue or inlet
board location J3
(faulty or hoses reversed)
Pressure Sensor