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35 posts


# 177696 11-Aug-2015 20:06
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Hi all, I need help with working out what's up with my two heat pumps. They are Carrier units - one big one downstairs, little one upstairs in the main bedroom. They have a three position switch on them for 'remote', 'emer' and 'test' and the units will run in 'test' mode and just blow cold. They do not respond to the remote, which they used to do last summer. I've changed the batteries, checked the IR output, all looks good. I've tried rebooting the pumps by flipping the breakers and using the master switches on the outdoor units but I'm getting nowhere. Any help would be much appreciated ! Cheers

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8462 posts

Uber Geek

  # 1363489 12-Aug-2015 10:19
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Both remotes and/or heat pumps simultaneously failing seems like too much of a coincidence for it not to be user error of some kind.
There was another thread here on heat pumps where I learned something - about the compressor heater, refrigerant absorption in oil, and risk of compressor damage if they're powered up with refrigerant condensed in the pump.  I wonder if they've got some kind of delay timer built in to prevent that possible damage if they've been powered off fully etc.  Perhaps a call to Carrier / agent is the next step.

249 posts

Master Geek

  # 1371268 20-Aug-2015 23:49
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You have done the simple things to check it. Reset by switching power off, changed batteries , so you'll need a technician to look at it. Call a local refrigeration company or call Carrier/Toshiba for your local service agent. Give them the model number of indoor units. They'll come with service manuals and go through fault diagnosis, check for fault codes etc.

The test mode forces unit into cooling which is used for system testing and checking refrigeration pressures. Sounds like it's cooling so refrigeration circuit should be okay. It's odd that both systems are not working. Maybe a power surge has damaged the circuit boards? Sometimes cockroaches, snails, slugs get into circuit boards and short out components. Both can usually be claimed on insurance.

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