2 you have a wireless room thermostat, remove the … This pan will probably be full of water. If the thermostat runs from the house’s electrical system, check on the circuit breakers. Most thermostats need a 24 VAC power supply. Without power, it’s no wonder that the thermostat clicks, but you have no heat or air. I replaced the thermostat in my 2005 Passat SW TDI now I have no heat, or should I say continuous heat, it comes and goes. The Safety Switch Was Triggered If you blow a fuse on the furnace control board, your thermostat won’t work properly. If your thermostat is blank, the first thing you should do is check the batteries. Replace your power supply if it fails your testing or you experience the symptoms I just described. Do these have timing chain . Then I asked him…could it be the wire lead to the thermostat? Changed the thermostat twice, replaced the water pump, flushed the radiator and heater core. After installation of the new transformer the thermostat is still dead. Replace the display back on the base and switch the power back on to see if your Nest Thermostat Unit is getting any power. .. Good luck! U need to remove trapped air or car could overheat due to poor coolant flow. If there is no power to the thermostat then you will need to call a professional electrician to run a new wire from the HVAC unit to the thermostat. 3. If it's not running you will need to identify the issue it may be a breaker, the furnace switch is off, the fuse in the furnace is blown, or one of many other power related issues. Turn on the gas supply Check the heat setting on both thermostats: They should be at the same temperature. The thermostat may have dead batteries. Many digital thermostats use batteries rather than being wired into the transformer that … You checked to make sure the appliance is plugged in, the device is switched on and the circuit breaker is not tripped, and yet the appliance is not receiving power. Reasons for a Blank Screen on a Honeywell Thermostat. Its compatibility with home Nexia intelligence system offers limitless possibilities including heating and cooling systems, smartphones, PC, and tablets. I had done something involving cooling system and … Clip the red lead to the power wire and the black lead to the negative wire. I changed the thermostat with the identical one from downstairs, which I know works, and it is still dead, further the dead tstat from upstairs works fine downstairs, so I have eliminated the tstat as the problem. Four times by raising the expansion tank up until fluid came out of the bleed hole. Test the wires to confirm the power is off, using a non-contact voltage tester. IF YOU CHANGED THE BATTERIES AND STILL HAVE A BLANK SCREEN, IT IS BECAUSE THE BATTERY CONTACTS ARE NoT CONTACTING THE BATTERY! If your thermostat screen has gone blank, and your thermostat runs on batteries, the first thing you should try is replacing the batteries with a fresh set. However, replacing your thermostat will give you the opportunity to make a small but extremely effective investment in your home’s energy efficiency. Heater is not working Inspection: $79.99 - $89.99: Get a Quote: Thermostat Replacement: $141.88 - … But the old one does not power now and display on the old stat does not come up. It is a rare occurrence, which is one reason why a situation where there is no power and the circuit breaker is not tripped can be puzzling at first. No change. 9. The operating thermostat (Key 42) is the component that you indicated has already been replaced along with the heater element (Key 14). Thermostat is on, outside unit not. My car has 105000 miles. Reset the breaker. Is your heating working now? We changed waterpump and thermostat . If the thermostat indicates a call for cool, verify that the furnace door is securely closed and that the power switch on the furnace is … Chances are, the batteries have died and the thermostat simply can’t power on. One of them might have tripped and cut off the power the thermostat. I have bled the system at the heater core 5 times. After you check the breaker box for your home, you also need to make sure that the furnace is turned on. But the new one didn't work and so, I put the old one back on. Unplug your computer immediately and skip the testing. Wrap the now-exposed Y1 wire end in electrical tape to avoid it touching any wires. The fan does not turn on at all. Many require batteries that need to be changed around once every year. This delay is to protect your equipment from short cycling. I disconnected all power prior to the change. Check the HG/HE setting under System in Menu options. If it is running that confirms power. Make sure the thermostat is set to the proper day: Auto / Fan does not turn on: 1. 3. Without more details that all I got! Batteries only keep the settings if power is lost. I have a Honeywell Thermostat - it was blinking "low battery", I changed the batteries, now the AC will not come on - it just blinks "Cool On" nothing is happening. I have bled the system at the heater core 5 times. If you had a recent electricity surge, it is quite possible that the breaker has been flipped. Also, we changed the thermostat hoping to fix an issue that when the unit is off entirely, the fan still runs intermittently??? Does the thermostat show any of the following icons or messages? Recommended Services. Check the Batteries. No power to thermostat [ 19 Answers ] Hi, I was trying to replace my old stat with a new programmble one. If the CH continues to run it is a control box or motorised valve problem. No display: Check battery position and battery life: Program does not change at desired setting: 1. None are loose. An ozone smell or very high pitched noise, combined with no power at all in the computer, is an almost certain indication that the power supply is bad. 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