Armstrong ERS-LC Series Manual page 47

A4: TEMP. SENSOR
DISCONNECTED
Possible causes and resolutions:
1. Check the electrical connections. The temperature sensor must be connected to the main board on connec-
tor X04 terminals 17 (2 red wires) and 16 (white wire). The ground wire is connected to connector X105 on
terminal 49.
2. Defective temperature sensor. Disconnect the temperature sensor from connector X04. Use a multimeter
to measure the resistance value of the PT100 at room temperature and compare this value using a PT100
resistance table.
If the value is different, the sensor is defective. Replace the sensor.
3. Electronic issue. Replace the main board and check that there is no steam or water flow in the electrical
compartment.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
Meaning:
The temperature sensor is either defective or disconnected.
In this case:
When this message appears, the tank is drained, the general fault
contact is activated, and the unit is then stopped.
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