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Hi, It could be the relay or the strip heat.... To figure out what is wrong you will need to check if power is getting to the strip heat or not...should have 220-240 V across the two legs going to the heat strip...when the heat should be on.
Your a/c model is only cool, but remote may be heat and cool which normally supplied by all manufacturers. Don't worry. In your remote heat mode will not respond by unit. Helpful advise?
Go to: www.us.sanyohvac.com This is Sanyo's official site. Click on the commercial tab then click on products. You then have to work your way thru to the type of system you have. Then click on the resources tab for your model. There you will find the manuals you are looking for and you can download them for free. If you can't find the exact model you are looking for just contact Sanyo's service number that is on there web site. Good Luck!
Heat pumps do loose their heating capacity and efficiency as temps drop. If you decide to rely on a heat pump you may want to make sure that your system has a back up heat strip, maybe even controled with an outdoor thermostat, if that is an option. The Mitsubishi is a great product.
dont know what model number it is but sounds like a bad control board, or a bad switch If you give the model# and serial# ill be glad to help you more :)
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