Ruud UGPH-07EAMGR Error Code 1 Blink (2-sec pause): 1 Hour Lockout
What Does Code 1 Blink (2-sec pause) Mean?
One blink of the green "OK" status LED followed by a 2-second pause on the UGPH-07EAMGR's UTEC 1012-925 control means the board counted four failed trials for ignition and dropped into a one-hour safety lockout. On each attempt the board energizes the gas valve for only 8 seconds — if it does not confirm a stable flame within that window, it closes the valve, purges, and tries again. After the fourth miss it stops trying for a full hour, running the blower and induced draft blower for about 100 seconds to clear any unburned gas.
Because this is a single-stage furnace with a 115VAC hot surface igniter, every ignition has to light full gas input, and that depends on the igniter glowing hot enough on each cycle. The most common reason for repeated misses is an igniter that has aged and no longer reaches ignition temperature; next most common is a gas valve that is not opening or delivering gas. Less often the control board itself is at fault.
This code is closely tied to the same board's flame-sensing logic. If the burners actually light but the amber flame-sense LED shows a weak signal, you may instead see the flame-sense codes on this board — a marginal flame-sense current shown by a slowly flashing amber LED, or a flame-sensing circuit fault shown by a rapidly flashing amber LED. A true one-hour lockout means the board never confirmed flame across four complete trials.
The 8-second valve-open timing and the high-voltage igniter circuit are exactly why this is not a homeowner repair — the diagnosis involves live gas and 115VAC components.
What You'll Notice
- The green status LED blinks once, pauses about 2 seconds, then repeats the pattern
- The furnace tries to start several times — you may hear the draft motor and a clicking gas valve — but no burners light
- After several failed tries the furnace goes completely silent for about an hour, then the sequence starts again on its own
- No heat from the registers even though the thermostat is calling
- You may see the igniter glow dimly or not at all during each failed attempt
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Faulty igniter | Most common | ✗ Call a pro → |
| Gas valve not opening | Common | ✗ Call a pro → |
| Faulty control board (IFC) | Uncommon | ✗ Call a pro → |
How This Is Diagnosed
A technician first watches a full ignition sequence to see how far it gets — whether the igniter glows, whether the gas valve opens, and whether flame is ever established. Because a worn hot surface igniter is the most common cause, its resistance and the 115VAC feed to it are checked early.
If the igniter is good, the tech confirms 24VAC at the gas valve and verifies actual gas flow through the valve, and checks the igniter's position relative to the burner. The control board is only replaced after the igniter, valve, and their wiring have all checked out.
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 repeatedly tries to light and then goes quiet for about an hour before retrying
- The igniter does not glow, or glows only dimly, during startup
- You hear the gas valve click but no flame ever appears
- The one-blink lockout returns after a part has already been replaced
- You smell gas at any point (leave immediately and call your gas company first)
Frequently Asked Questions
Can I reset the one-hour lockout without waiting?
Yes — turning the furnace off at its switch or briefly cutting the breaker and restoring power clears the lockout so it can retry. But if the underlying cause remains, it will simply lock out again after four more failed attempts.
Is it dangerous to let it keep trying to light?
The board is designed to fail safe — it opens the gas valve for only 8 seconds per attempt and purges afterward. Still, running it repeatedly without fixing the cause wears out the igniter and delays heat, so it is better to have it diagnosed.
How much does it cost to fix a 1-blink lockout?
It depends on the actual cause and your region. A hot surface igniter is a relatively inexpensive part, while a gas valve or control board costs more, so pricing varies widely — get a local quote.
Sources
✓ Verified against manufacturer service manual — March 2026