Checking Flame Rollout Switch - Daikin M Series Service And Troubleshooting

SERVICING
High Voltage!
Disconnect all power before servicing or
installing. Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
1. Remove the wires from the auxiliary limit control
terminals.
2. Using an ohmmeter, test for continuity across the two
terminals. No reading indicates the control is open.
Push the red reset button, test again - if still open,
replace the control.
Testing Auxiliary Limit Control

Checking Flame Rollout Switch

A/GPDM3 units are equipped with a temperature-activated
manual reset control. This control is mounted to the
manifold assembly and is wired in series with the auxiliary
limit and gas valve. The control is designed to open should
a flame roll out occur. An over firing condition or flame
impingement on the heat shield can also cause the control
to open.
WARNING
If the rollout control has opened, the circuit between the
ignition control and gas valve will be interrupted and the
ignition control module will go into lockout. The servicer
should reset the ignition control by opening and closing the
thermostat circuit. The servicer should look for the ignitor
sparking which indicates there is power to the ignition
control. The servicer should measure the voltage between
each side of the rollout control and ground while the ignition
control is try to power the gas valve.
Checking Flame Rollout Switch
Limit Switch Operation (Applies to Primary, Auxilia-
ry, and Roll Out Limits) DSI systems.
If a limit switch opens, the indoor blower is energized on
heat speed and the induced draft blower is energized. The
36