To Next PageTo Next PageWhat to do if Honeywell Control Unit displays 4 flashes?
If the Honeywell Control Unit displays 4 flashes, it indicates that the temperature cut-out limit has been reached. You should check the valves and the water temperature sensor. Additionally, reduce the water temperature setpoint and thoroughly check the main valve operation and water temperature control.
What to do if Honeywell WV8840B Control Unit displays 5 flashes?
If the Honeywell Control Unit displays 5 flashes, this indicates a failure of the water temperature sensor. You should check the water temperature sensor and its connection for open circuits, shorts, or differences in resistance between the two sensor elements.
What to do if Honeywell Control Unit displays 2 flashes?
If the Honeywell Control Unit displays 2 flashes, it means there's low thermopile voltage or the main valve isn't turned on. Check the thermopile and its connections, and also check the pilot flame.
What does it mean when Honeywell WV8840B Control Unit displays 8 flashes?
If the Honeywell Control Unit displays 8 flashes, it indicates that the control does not see power decaying with the knob in the OFF position. Check the valves.
What to do if Honeywell WV8840B displays 7 flashes?
If the Honeywell Control Unit displays 7 flashes, it indicates an electronics failure. The suggested solution is to replace the control module.
What does it mean when Honeywell Control Unit displays 6 flashes?
If the Honeywell Control Unit displays 6 flashes, it means tank leakage has been detected by the accessory module. The control recovers after receiving message from accessory module.
Why is the Honeywell Control Unit indicator solid ON in OFF mode?
When the control is in OFF mode and the indicator is solid ON, no action is required. Wait until the LED turns off if you want to restart the system.
General| Model | WV8840B |
|---|---|
| Manufacturer | Honeywell |
| Category | Control Unit |
| Voltage | 24 VAC |
| Type | Gas Control |
| Gas Type | Natural Gas or Propane |
| Operating Temperature | -40°F to +175°F (-40°C to +79°C) |
| Humidity Range | 5 to 95% RH |
| Communication Protocol | Modbus |
Covers temperature and humidity ranges for operation and storage.
Lists device certifications and available accessory parts.
Includes pressure, mounting, and input voltage requirements.
Highlights that WV8840 controls are for direct replacement only.
Covers frequent cycling, water/steam, humidity, chemicals, dust, and heat.
Presents the typical capacity curve and gas capacity conversion table.
Lists essential steps and warnings before commencing installation.
Illustrates how to mount the WV8840 control on the water heater tank.
Advises not to remove protective caps until ready to connect piping.
Warns about explosion hazards and shows sediment trap installation.
Emphasizes that all wiring must comply with applicable electrical codes.
Directs users to appliance manufacturer instructions for filling the tank.
Explains purge time for air and LED blinking patterns for normal operation.
Warns about scalding hazards and proper temperature adjustment.
Covers safety warnings, water damage caution, and leak test steps.
Includes safety warnings and procedures for checking gas input via meter or manometer.
Discusses maintenance frequency, criteria, and safety warnings.
Describes how to use the status indicator for diagnosing issues.
Lists LED error codes, detected failures, and recommended actions.
Provides a flowchart for troubleshooting when the status light is not available.
Shows a graph of thermopile output over time for diagnosis.
Provides critical safety instructions for homeowners regarding gas smell and scalding.
Details the steps for completely shutting down the appliance.
