It is lit up, but cannot change any settings, can't select zones, and heater/ac is not working now at all apparently because the thermostat is no longer controlling it. It worked last night, but quit sometime before daylight.
It is a heat pump/AC system by RV Products, a division of Airxcel, Inc. Thermostat is by RV Products and is called a 8330A335 multi zone thermostat controller system
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You are correct about the "er" message. Best bet is to check your user manual for error codes and then take it from there. If nothing in book it is possible that the answer might be on manufacturer web site.
Could be issue with thermostat itself if the other zone is being cooled properly.
question: do you have a multiple thermostat setup in 1 zone? If so check what settings are for your heat on each thermostat. Make sure that the heat is not set higher than the room's temperature.
check what settings are for your cooling on each thermostat. Make sure that the cooling is set accordingly.
if you have multiple thermostats setup in 1 zone. the thermostat with the lowest temperature will reign supreme. The heat setting on that thermostat will be what's causing the buzz on the heater.
optionally, hard reset your thermostat as a precaution. Here's how to do so: there are two types of thermostats i know of programmable and non-programmable.
disable auto & enable manual; however do NOT change settings or power-off t-stat. Remove battery and power down the thermostat until you see nothing on the thermostat monitor; power OFF the switch connected to your t-stat. Remove battery and reinsert inverted, if needed, press whatever button that your heart desires to make sure that nothing is absolutely drawing into that mode, button, etc; wait (5sec-1min); remove batters; wait 1min; then, reinsert batteries in its correct position; if you have a programmable thermostat; do the same with the hit 'reset filter' held down observe if the roomTemp reading has changed.
May I suggest to keep an extra thermometer around to determine if temperature reading accurately?
If reset requires a reprogramming to your t-stat, do whatever required to set your desired setting.
cheers, best of luck. i hope i've helped.
background, doing a hard reset in my opinion is similar to removing the battery from a PC motherboard.
If you have an ML300HGA, it is a manual-control heater, which means you turn it on and you turn it off. No thermostat. It does not have an AUTO setting.
Likewise, the thermostat-controlled models do not have a Manual mode. If you have the ML300TBA, it has a thermostat and will turn itself on/off in order to maintain a room temperature.
On manual models, the numbers (if any) on the dial are heat output selections. Set the control to the highest heat setting and that's what it does until you turn it off.
On automatic thermostat models, the numbers on the dial are temperature selections. Set the control to the highest heat setting and the heater will continue running until it is 85-90 degrees, then shut off. Set it around 2 and it will maintain a temp of around 70 degrees.
All Procom heaters are either automatic (thermostat-controlled) or Manual. None are both.
Based on the limited info.I have, it sounds like the heating element is not getting power. suggest visually inspecting the switch and thermostat for burnt wires. Also check the heating element for broken electrode.