Error code reference

Trane Furnace Error Code 7

System lockout Retry

System lockout Retry — 3 unsuccessful tries for ignition within a single call for heat; flame has never been sensed.

First step from the service manual

Disconnect electrical power to furnace, connect manometer to inlet gas pressure connector, verify inlet gas pressure is within specifications.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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System lockout Retry — 3 unsuccessful tries for

From Service Manual 469967, p.19:

1.Disconnect electrical power to furnace, connect manometer to inlet gas pressure connector, verify inlet gas pressure is within specifications.

2.Measure the inlet valve coil resistance at the valve connector. Expected: 1,000 to 1,200 ohms per coil at room temperature.

3.Verify static water supply pressure at the inlet hose. Below 20 psi or fluctuating supply commonly triggers fill-timeout faults.

Part WPW10212598

Water inlet valve

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