Hello
From Page 32 in the 25-EPI owners manual you may have a stove that is not responding and to call Englander Tech support. See Phone number in last line below:
THERMOSTAT OPERATION
Thermostat Operation Details
The 25-EP was designed to operate equally well in both manual and thermostat mode.
While using the control board for heating control gives the user control over the heat
output of the stove, the thermostat allows the stove to “start-up” and “shutdown”
independently, which will help maintain your house at a more constant temperature and
save pellet fuel.
The 25-EP can be connected to either a wall thermostat (Part # PU-DTSTAT) or wireless
remote thermostat (Part # AC-3003). Although either thermostat will operate the stove
properly, we highly recommend the wireless thermostat for the convenience of starting
your pellet stove from anywhere in the house.
THERMOSTAT OPERATION: This stove is equipped with a unique, new feature that
allows two options for thermostatic operation: The stove comes from the factory preprogrammed
in “On/Off mode,” which turns the stove on and off when the call for heat
comes or leaves, like a furnace. The second, or “High/Low mode,” burns at whichever
heat range you set the stove at until the call for heat leaves, at which point the stove goes
to the Low heat range setting.
To set the stove in the “High/Low mode,” unplug the unit and plug it back in, then press
and release both down arrows; H L appears in the heat range and blower speed windows.
The unit is now in “High/Low mode.” (Note: Repeat this to change back to “On/Off
mode;” a 0 0 will appear in the heat range and blower speed windows). Using a
thermostat in On/Off mode may shorten the life of your stove’s igniter.
Please note: Certain units may not respond to this; if your unit does not respond in this
manner please contact Technical Support at (800) 245-6489.