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Watlow EZ-ZONE Temperature Controller

Watlow EZ-ZONE Temperature Controller code Er.i1: Er.i1 (Error Input 1, toggling with Attn message)

An input error is active on the attention parameter, meaning a specific sensor or calibration fault is present.

Code
Er.i1
Name
Er.i1 (Error Input 1, toggling with Attn message)
Controller
Watlow EZ-ZONE Temperature Controller
Type
Sensor open circuit
What it does
Fault: the equipment trips and stops
Risk
YELLOW Booth plays by its own rules
Reset
Clears on its own when the condition goes away
Source
The manufacturer's manual (subscribers see which manual and page)

Updated July 22, 2026

How to fix it

Subscribers get:

  • What to do next, in plain words
  • Which manufacturer manual it comes from, linked
  • The 4 common causes listed for this code
  • The step by step check for this problem, one check at a time
  • Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
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Questions about this code

What does Watlow EZ-ZONE Temperature Controller code Er.i1 mean?

An input error is active on the attention parameter, meaning a specific sensor or calibration fault is present.

Is Watlow EZ-ZONE Temperature Controller code Er.i1 dangerous?

It is graded yellow: not hard, but a booth does it differently than the gear most techs know, so follow the checks in order.

How do I fix Watlow EZ-ZONE Temperature Controller code Er.i1?

The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.

Other Watlow EZ-ZONE Temperature Controller codes

---- · ---- (four dashes in upper display)OpEn · OpEn (Input Error i.Er value = Open)shrt · shrt (Input Error i.Er value = Shorted)AL.E1 · AL.E1 (Alarm Error 1)AL.L1 · AL.L1 (Alarm Low 1, toggling with Attn)AL.h1 · AL.h1 (Alarm High 1, toggling with Attn)vaL.L · vaL.L (value too low to display, less thvaL.h · vaL.h (value too high to display, greate

All 9 Watlow EZ-ZONE Temperature Controller codes · Every fault code