HEARTBEAT (component-test post-indication)
Post-component-test indication: no errors detected. Visual check of hot surface igniter, inducer, and blower motor required.
This code typically points to
- Normal post-component-test result when no setup error is present and visual component sequence completes
Next checks to confirm
- Run component test with R disconnected and SW1-6 ON
- Observe inducer high-speed, igniter ON, blower ON, then inducer low-speed
- If heartbeat is post-test indication, verify visually that those components actually operated
Escalation
No escalation if observed sequence matches OEM component-test sequence. Escalate only if heartbeat appears but a component visibly failed to operate.
Reset behavior
After testing, put SW1-6 in OFF position and reconnect R thermostat lead.
Informational
No action needed