E15
Ravenheat Room Thermostat / External Control Fault

Furnace displays E15 and will not respond to thermostat calls.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Open-circuit room thermostat wiring, Faulty external control (e.g., programmer), Incorrect control wiring at terminal block, PCB input fault for thermostat

How to Fix / Troubleshooting

Safety: Isolate power before working on control wiring. Low-voltage circuits can still be damaged by shorts.

User checks:

  • Ensure the room thermostat or programmer is set to call for heat and that its batteries (if wireless) are good.
  • Check that any external timeclock is not set to OFF or holiday mode.

Technician checks:

  • Bridge the room thermostat terminals at the furnace to simulate a call for heat; if the furnace runs, the external controls or wiring are faulty.
  • Inspect thermostat cable for damage, especially at entry points.
  • Verify correct wiring according to the Ravenheat wiring diagram.
  • If wiring and controls are sound, test the PCB thermostat input and replace PCB if necessary.
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Repair Difficulty

Medium 3/5

Required Part

Room Thermostat
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