Cooper & Hunter GRS-C3.5/A1-K User Manual

Cooper & Hunter GRS-C3.5/A1-K

29 pages

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Please read this manual carefully before using this product and keep it properly for future reference.

GRS-C3.8/NbA-K

GRS-C5.0/NbA-K

Direct & Circulating Air Source

Heat Pump Water Heater Technical

Air Source Heat Pump

Water Heater

Air Conditioners

Installation and Operation Manual

Designed by Cooper&Hunter International Corporation, Oregon, USA

www.cooperandhunter.com

MODEL:

Table of Contents

Other manuals for Cooper & Hunter GRS-C3.5/A1-K

Service Manual51 pages

Questions and Answers:

M
michaelbrownAug 10, 2025
Why does my Cooper & Hunter GRS-C3.5/A1-K Heat Pump wired controller show L6 and the water temperature?
- M
  Mr. David NguyenAug 10, 2025
  The wired controller displaying L6 and the water temperature alternately indicates that the ambient temperature is outside the operational range of the main unit, preventing it from starting. In this situation, the auxiliary electric heater will run independently, which is normal.

Cooper & Hunter GRS-C3.5/A1-K Specifications

General

Brand	Cooper & Hunter
Model	GRS-C3.5/A1-K
Category	Heat Pump
Language	English

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