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Old 01-07-2017, 06:37 PM   #1
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2015 Bus 45UP mid furnace not working on gas setting

We are getting some cold temps here in North Carolina so I turned on the Aqua Hot system and the mid thermostat does not run. The front and rear work fine but nothing out of the mid system. Any ideas on what might be wrong? Thanks,
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Old 01-07-2017, 08:43 PM   #2
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The mid thermostat does not control the Aquahot only the front and rear thermostats control Aquahot heating zones.

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Old 01-07-2017, 09:09 PM   #3
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Very good to hear, thanks. Do you know the reasoning behind that?
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Old 01-07-2017, 09:33 PM   #4
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Your Aquahot model 450D has only 2 heating zone circulation pumps, a stir pump and an engine preheat pump. Only two thermostats are needed to control the Aquahot coach heat. The stir pump operates when hot water is called for. The engine preheat pump operates when needed for heating the cummins engine block.
Your middle thermostat will only operate the roof middle air conditioner and electric heat pump.

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Old 01-07-2017, 09:54 PM   #5
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Good to know, thanks. At what temperature would you recommend using the engine block preheat?
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Old 01-08-2017, 07:38 AM   #6
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Hi Carolina,
Your block heater would only be used prior to starting the engine in real cold weather. I've never had to use mine yet but I would think that if you were staying a few days where the temp dropped to 20's or less you would want to turn it on several hours before starting the engine. Keep in mind that you also have a electric engine block heater switch up in the drivers compartment (left side of dash).

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Old 01-08-2017, 11:09 PM   #7
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Thanks Sammie, I thought that block heater switch was calling on the Aquahot system. So I guess what is happening is even with the inside thermostats off the Aquahot system is answering the thermostat in the wet bay and circulating hot fluid through the engine and keeping the basement compartments warm, pluming to I assume. Thanks again,
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Old 01-09-2017, 06:46 AM   #8
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Carolina,
The engine preheat switch on your spyder panel operates the engine block preheat pump only and is independant of any other operation of the Aquahot unit. In order for the basement wet bay thermostat/heat to work, the bedroom thermostat MUST be on also.

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