The thermistor is directly related to E1 error code. There are different resistance levels at different temperatures. I would try this thermistor test and more than likely I would replace the thermistor
The machine control electronics monitors the
exhaust temperature using the thermistor, and
cycles the heater relay on and off to maintain
the desired temperature.
Begin with an empty dryer and a clean lint
1. Plug in dryer or reconnect power.
2. Set the following configuration:
➔ Door – must be firmly closed
➔ Press Control On
➔ Press End Of Cycle Signal (Louder)
➔ Press Start
3. If after 60 seconds, E1 or E2 flashes in the
display and the dryer shuts off, the thermistor
or wire harness is either shorted or open.
➔ Unplug dryer or disconnect power.
➔ Check wire connections at the machine
control electronics and thermistor. See
Accessing & Removing the Electronic
Assemblies, page 7, and figure 8 for
➔ If wire connections are good, remove the
two wires from the thermistor and replace
And Sublime Master KurtiusInterupptus offers this caveat:
Just because the thermistor checks good @ room temp doesnt. Mean it stays within tolerance as it heats up...
Thermistor part link ==> Thermistor
And how to replace it:
Source: Whirlpool Duet GEW9200LW1, E1 error code