Rheem RGPH-07EAMGR Furnace Error Code 1 Blink (2-sec pause): 1 Hour Lockout
What Does Code 1 Blink (2-sec pause) Mean?
On the UTEC 1012-925 Integrated Furnace Control (IFC) in the Rheem RGPH-07EAMGR, the "OK" status LED flashes once and then pauses about two seconds to report a 1-hour lockout. The board reaches this state only after it has tried to light the burners four times without confirming a flame. During each trial it energizes the gas valve for about 8 seconds; if the flame-sensing circuit does not prove a flame in that window, the trial fails.
Rheem's own troubleshooting flowchart for this lockout walks through the hot surface igniter and the electrical path to the gas valve rather than a sensor cleaning: it directs a technician to check that the igniter glows, confirm the igniter and its wiring are intact, and measure that 24VAC actually reaches the gas valve during a trial. Depending on what those checks find, the repair is replacing the igniter, correcting wiring, replacing the gas valve, or replacing the IFC board itself.
After the fourth failure the board holds the lockout for one hour, runs the blower and induced-draft blower for about 100 seconds to clear the heat exchanger, then retries automatically. Do not confuse this single-blink status-LED lockout with the separate amber flame-sense LED: a slow amber flash (see Marginal Flame Sense Current) warns of a weak-but-real flame signal before a full lockout occurs, while a rapidly blinking amber LED points to flame detected when none should be present.
Because the manufacturer's diagnostic path for this code runs through the igniter, wiring, and gas-valve voltage rather than a simple sensor cleaning, a technician's diagnosis is needed to find which component is at fault.
What You'll Notice
- The status LED repeats a single blink then a 2-second pause, and the furnace makes no heat for up to an hour.
- You may hear the igniter glow and the burners light briefly, then shut off after a few seconds, repeating up to four times.
- Warm air never reaches the registers; the blower and inducer run for about 100 seconds after the last failed try before going quiet.
- The furnace attempts to relight on its own roughly an hour later.
Common Causes
How This Is Diagnosed
A technician follows Rheem's flowchart for this lockout: confirm the igniter glows during a trial, check the igniter and its wiring for damage or looseness, and measure whether 24VAC reaches the gas valve when the board calls for ignition. Depending on those findings, the repair is replacing the igniter, correcting or replacing wiring, replacing the gas valve, or replacing the IFC board.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The furnace shows the single-blink, 1-hour lockout code, since the manufacturer's diagnostic path for this fault requires checking the igniter, wiring, and gas-valve voltage with test equipment
- The igniter never glows, or the burners never light during the ignition attempts
- The burners light but the flame is weak, yellow, or lifts off the burner
- You smell gas at any point, or the furnace short-cycles on and off repeatedly
Frequently Asked Questions
Will my Rheem furnace fix itself after the 1-hour lockout?
The board retries automatically once the hour is up, so heat may return on its own if the cause was temporary. But if the underlying cause — a failing igniter, a wiring problem, or an issue at the gas valve — remains, it will simply lock out again after the next four failed tries. A technician needs to find and correct that cause.
Why does the furnace try four times before locking out?
The UTEC control gives the burners four chances to light, energizing the gas valve for about 8 seconds each try. Four failures in a row trigger the one-hour safety lockout so raw gas is not repeatedly introduced.
Can I diagnose this lockout myself?
Rheem's troubleshooting path for this code involves confirming igniter glow, checking wiring, and measuring 24VAC at the gas valve during a trial, which needs a multimeter and electrical know-how. It's a technician's diagnosis, not a homeowner check.
Sources
✓ Verified against manufacturer service manual — March 2026