Question 1

mysa makes a quiet but annoying buzzing sound, only when the heat is on. is this normal?

Accepted Answer

DIAGNOSIS An audible buzz from the thermostat indicates component vibration. This is often caused by a slightly loose wire connection on the high-voltage terminals, creating micro-arcing or vibration. FIX Turn off the circuit breaker. Remove the Mysa faceplate. Firmly tighten the screws on the L (Line) and 1 (Load) terminals. Also check the N (Neutral) terminal. Do not overtighten. Reattach the faceplate and restore power. IF THAT DIDN'T WORK The buzz may be originating from the internal relay or transformer. This can be normal operational sound for some units, but it should be very faint. If loud, contact Mysa support. HEADS UP A loud hum or crackling sound is not normal and indicates a dangerous fault. Power off the unit at the breaker immediately and inspect the wiring at the heater for damage.

Question 2

my heater turns on with mysa but the room never seems to get up to the temperature i set, it always feels cold.

Accepted Answer

DIAGNOSIS The system is undershooting the setpoint. The primary cause is an incorrect "Heater Type" setting in the app, which affects the thermostat's power calculation and cycling behavior. FIX Open the Mysa app. Select the problematic thermostat. Go to Settings > Heater Configuration > Heater Type. Confirm it is set correctly: "Baseboard (Convection)" for standard baseboards, "Fan Forced" for a fan heater insert. IF THAT DIDN'T WORK Check for external factors. Ensure the heater is not obstructed by furniture or curtains. The Mysa's temperature sensor is in the unit itself; ensure it is not in a direct draft or in a hot/cold spot on the wall. HEADS UP The Mysa has a built-in temperature offset calibration feature. Use this only as a last resort after verifying the Heater Type and physical environment.

Question 3

can't add my mysa to the app, it just spins forever during the 'connecting to device' step.

Accepted Answer

DIAGNOSIS The phone is failing to establish a direct Bluetooth connection to the thermostat for initial setup. This is usually a phone permission or location services issue. FIX On your phone, go to Settings. For the Mysa app, ensure Bluetooth and Location Services permissions are set to "Allow" or "While Using the App". On Android, ensure Location is physically turned on (GPS). Force close the Mysa app and restart it. Begin setup again. IF THAT DIDN'T WORK Move your phone physically closer to the Mysa thermostat (within 3 feet). Ensure no large metal objects are between the phone and thermostat. Temporarily disable any VPN or ad-blocking apps on your phone. HEADS UP The initial setup connection uses Bluetooth Low Energy (BLE), not Wi-Fi. Your phone's Wi-Fi does not need to be on, but location services are often required for BLE to function on modern OSes.

Question 4

getting an 'err 8' code on my mysa, what does that mean and how do i clear it?

Accepted Answer

DIAGNOSIS Error 8 indicates a detected voltage mismatch or irregularity. The thermostat has measured a voltage outside its expected operating parameters. FIX Turn off the circuit breaker. Remove the thermostat faceplate. Verify you have the correct Mysa model (V1 or V2) for your voltage system (120V, 208V, 240V). Confirm all wire connections are tight and correct: L, 1, N. IF THAT DIDN'T WORK Use a multimeter to measure the voltage between the Line and Neutral wires at the wall. It should be within 10% of your system's rated voltage (e.g., 216V-264V for a 240V system). If not, the issue is in your home's electrical supply. HEADS UP Error 8 can also appear briefly during a power surge or brownout. If it clears after a power cycle and doesn't return, it was likely a transient grid issue.

Question 5

mysa screen is completely blank, no lights, nothing. heater works if i wire it directly but not with the mysa.

Accepted Answer

DIAGNOSIS The thermostat has no power. This indicates a lack of voltage, a blown internal fuse, or a defective unit. FIX First, check the home's circuit breaker panel. Ensure the breaker for the baseboard heater is fully in the ON position. If it was tripped, reset it. IF THAT DIDN'T WORK Power off the breaker. Remove the Mysa and check the white neutral wire connection. A missing or loose neutral will result in no power to the display. Ensure it is securely fastened. HEADS UP If the breaker trips again immediately after installing the Mysa, you have a wiring short. Do not repeatedly reset the breaker.

Question 6

installed mysa but the heater won't turn off, it just runs constantly no matter what temperature i set

Accepted Answer

DIAGNOSIS The Load circuit is stuck closed. The most common cause is a wiring fault where the Line and Load wires are shorted together behind the thermostat or at the heater. FIX Turn off the circuit breaker immediately to prevent overheating. Remove the Mysa faceplate. Ensure the red (Load) and black (Line) wires are not touching each other or the backplate. Ensure no stray wire strands are causing a bridge between the L and 1 terminals. IF THAT DIDN'T WORK The short may be at the heater connection point. You will need to inspect the wiring at the baseboard heater itself for a crossed connection. HEADS UP A heater running constantly is a fire risk. Do not leave the circuit breaker on while diagnosing this issue.

Question 7

my mysa keeps disconnecting from wifi every few days and i have to reboot it to get it back online

Accepted Answer

DIAGNOSIS The thermostat is losing its Wi-Fi connection. This is typically caused by router settings that conflict with the Mysa's stable connection requirements. FIX Log into your router's admin settings. Disable the following features for the Mysa's IP address or MAC address: Band Steering, Airtime Fairness, and Smart Connect. Ensure the Mysa is connected to a 2.4 GHz network, not 5 GHz. IF THAT DIDN'T WORK The issue may be signal strength. Use the Mysa app to check the Wi-Fi signal strength on the thermostat's settings page. A value below -70 dBm is weak. Consider a Wi-Fi extender. HEADS UP Router firmware updates can sometimes re-enable these problematic features. You may need to repeat this process after a router update.

Question 8

my new mysa thermostat says 'no power' on the screen and my baseboard heaters are cold, did i wire it wrong?

Accepted Answer

DIAGNOSIS The thermostat is not detecting line voltage. This is almost always an installation wiring error, specifically reversed Line and Load wires. FIX Power off the circuit breaker. Remove the thermostat faceplate. Confirm wire connections. The black wire from the wall must connect to the Mysa's L (Line) terminal. The red wire from the wall must connect to the Mysa's 1 (Load) terminal. The white neutral wire must be secure. Reattach faceplate and restore power. IF THAT DIDN'T WORK Verify the circuit breaker is fully on. Use a multimeter to confirm 240V AC between the black and red wires at the wall with the breaker on and wires disconnected from the Mysa. HEADS UP Incorrect wiring can damage the thermostat. Always confirm power is off at the breaker before handling wires.

Mysa Smart Thermostat for Electric Baseboard

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