I've had a RIH 2667 air conditioning and the heating mode doesn't work quite right. I've set the temperature at 25 and it will start the heating mode just fine for 15 minutes then the display number on the machine will start jumping up to 30 and above then stop from heating. The room temperature at that time was only around 20-21 degree. A technician came over and has determined that must be the indoor unit sensor and has changed it but the machine is still doing the same thing. Could anyone please tell me what is wrong with it?
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There are several things that you can do about a heater blowing cold air, but if you keep running into problems then it might just be time to call in a heating repair company. If need be, here is a useful article on: HVAC installation cost, and how to get a fair price. How serious of an issue this is depends greatly on where you live. If you live in the north (Bozeman, MT, etc), then I'd recommend you have your furnace inspected annually to ensure that it is working properly. I'd also recommend that you install a backup means of heat...just in case. ASM has over 25 years of heating and air conditioning experience. If you have questions about a heater blowing cold air or any other HVAC related topic, try the ASM Air Conditioning and Heating Blog or if something your contractor is telling you seems expensive or doesn't sound quite right, consider using our Online Air Conditioning Consultation Service.
You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.
If this is a new problem, a temperature sensor may have gone bad. But if this is a new car to you, some Climate Control cars work this way.
Some will allow for Vent or Panel just to get air circulating, but the A/C should come on when you select A/C unless the outside temperature is too low.
For heater functions, the engine must warm up enough to provide heat. The Climate Control models will not turn on until it compares your temperature settings with how hot the engine water temperature is to provide this heat for you.
Now you may need to check the Antifreeze levels and check the temperature of the Radiator water to know if the Thermostat is working properly.
Let see if I can help. The numbers don't come up so we'll just try your information.
Exhaust - should be closed when using for Air Conditioning Energy savings turns the fan off with the compressor when set for Air Conditioning Fan Only means just that (no Air Conditioning) Fan speeds Quite same as low, Norm same as medium, Super same as High Temp settings, what the thermostat senses before cycling compressor.
Make sure the remote control 'Mode' setting is on 'Heat', usually an icon that looks like a small sun. Then increase temperature setting until unit switches on. Can take 7 minutes or so to give any warm air flow, but if nothing after about 15 mins, then you have a problem. - Rick
Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
Set the mode selector to FLOOR mode.
Set the heater control selector to the warmest temperature setting.
Set the blower speed the lowest setting.
Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
Set the mode selector to PANEL mode.
Select the maximum blower speed.
Select the warmest temperature setting.
Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
Inspect the temperature door operation. Repair any problems found, go to step 17.
Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
Replace the heater core. When the repair is completed, go to step 17.
Check for low engine temperature problems, Repair or replace as needed, go to step 17.
Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.
The ECO HEAT/COOL button of your hybrid functions to reduce the consumption of electricity thus, a reduction of fuel consumption. An indicator 'ECO' appears on the air conditioning display to indicate that the mode is on. Of course, with the ECO HEAT/COOL on it'll take longer than the usual amount of time for the temperature to reach its normal or standard set temperature.
Your ECO HEAT/COOL mode won't function if your temperature control is set at 'LO" or 'HI" or if the air flow is in the "floor/windshield mode" or "windshield mode".
Your inside cooling coil in the air conditioning mode could be frozen over. Change the fan setting to on and operate it that way when in the cooling mode. Turn the air conditioning OFF with the fan ON to clear the coil of frost which should take about 1 hour.
The fact that you have sweat on the large line means that the temperature of the gas inside the line is below the due point of the moisture in the air. A good tech would measure the pressures and temperature of the system to get what is called superheat to determine proper system charge of refrigerant.