Heat Controller manual Troubleshooting Chart, DXM2 Functional Troubleshooting Flow Chart, Start

Heat Controller, Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual

Troubleshooting Chart

Use the following troubleshooting flow chart to find appropriate troubleshooting strategies on the following pages for the DXM2 control and most water source heat pump applications.

		Start
		Did Unit
		Attempt to
		Start?
			Yes
		Did Unit
		Lockout at
		Start-up?
			No
See “Unit	Yes	Unit Short
short
		Cycles?
cycles”
			No

DXM2 Functional Troubleshooting Flow Chart

No	Check Main
	power (see power
	problems)
Yes	Check fault code on communicating
	thermostat (ATC32) or Configuration
	and Diagnostics Tool (ACD01)

No fault

shown

Replace DXM2

See “Only Yes Fan Runs”

See “Only Yes

Comp

Runs”

See “Does No not Operate

in Clg”

Only Fan

Runs?

No

Only

Compressor

Runs?

No

Did unit lockout after a period of operation?

No

Does unit operate in cooling?

Yes

See fault codes in table on following page

Yes

Unit is OK!

‘See Performance Troubleshooting’ for further help

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