Miller Q5RF-A Installation guide

Q5RF-A
Miller
Brand
Miller
Model
Q5RF-A
Type
Installation guide

This manual is also suitable for

Error Code Status for Demand Defrost Board with Delay
This document lists the Error Code Status for Demand Defrost Board (Part Number 624733), wherever applicable.
ADDENDUM
Specifications & illustrations subject to change without notice or incurring obligations (07/19).
O’Fallon, MO, © Nortek Global HVAC LLC 2019. All Rights Reserved.
D3116400
(NEW)
ERROR CODE STATUS
LIGHT (RED LED)
DIAGNOSTIC DESCRIPTION
OFF No power, check for 24VAC power to the board
ON Normal Operation
1 Flash
Anti short cycle timer activated with compressor demand, anti short cycle is 5
minutes long
2 Flashes
Low pressure switch lockout. Low pressure switch is open. The pressure switch is
ignored the first 90 seconds after the compressor is energized in the heating mode
3 Flashes High pressure lock out. High pressure switch is open
4 Flashes
Ambient sensor fault (outdoor temp sensor). Sensor Ohm out, check for resistance
and compare to the 10k thermistor chart. If the sensor fails, the control will revert
to a time and temp defrost
5 Flashes
Coil Sensor Fault (Coil temp Sensor). Sensor Ohm out, check for resistance and
compare to the 10k thermistor chart. If the sensor fails, the unit will not defrost
6 Flashes
Low pressure switch lockout. If the low-pressure switch opens in the heating mode
3 times within 120 minutes, the unit will lockout the compressor. If the low-pressure
switch opens 3 times in the cooling mode, the board will lockout the compressor
7 Flashes
High Pressure switch lockout. If the high-pressure switch opens 3 times during a
heating call within 90 minutes, the board will lockout the compressor. If the high-
pressure switch opens 3 times during the same call for cooling, the board will lock
out the compressor
Table 1. Error Codes and Diagnostic Description
  • Page 1 1

Miller Q5RF-A Installation guide

Q5RF-A
Miller
Brand
Miller
Model
Q5RF-A
Type
Installation guide
This manual is also suitable for
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