L.B. White Tradesman 400 Dual Fuel Owner's Manual And Instructions page 23

-- Igniter continues to spark until fl ame proving occurs.
-- Ignition spark is cut off.
-- Gas valve stays open.
-- Room warms to desired temperature.
-- Thermostat is satisfi ed.
-- Heater shuts down.
-- Process starts again on a call for heat.
IGNITION FAILURE SEQUENCE:
-- Trial for ignition takes approximately 10 seconds.
-- If ignition module does not sense a fl ame within the
ignition trial, the module goes into safety lockout (3
fl ash pattern).
-- Gas valve closes.
-- Ignition spark shuts off.
-- Fan motor stops. (See note below).
-- To retry for ignition, the systems must be reset:
-- Turn the thermostat down and then up to call for
heat or unplug heater and plug it back in.
NOTE: Tradesman 170 Standard Heaters:
If ignition failure occurs, the fan
motor continues to operate.
Tradesman Construction Heaters
Owner's Manual • Tradesman
23