Utica Boiler Error Codes: STA 1, STA 8, 62 and 133

Make one complete fault record

Use an accessible model label or the paperwork. Write down the full model, the letters and number, any accompanying words, and whether the house is getting heat. If the display alternates, capture both parts.

The MGB tables here cover MGB-75J, 100J, 125J, 150J, 170J and 200J with the integrated control described in Utica’s December 2013 Rev. D manual. They are not a chart for every MGB control revision.

Utica’s MGB display key identifies StA as Current State and Err as Error Code. The UB95M-200 uses an alternating 9/b display for soft lockouts and a flashing E with a number for hard lockouts.

See whether the operating state fits the heating demand

In Utica’s MGB Table 6, state 1 has two entries: standby with no call for heat, or a heat request with water already hot enough to run only the circulator. A quiet burner can therefore fit either situation.

Look at the room thermostat: is the room already at the temperature you requested, or is it cold and asking for heat? Report that alongside STA 1. Do not raise the boiler’s water temperature setting just to make the burner light.

For STA 8, Utica says the system is running and a flame signal must be present. If that state appears but the rooms stay cold, the useful next question is where the heat stops reaching them. The boiler circulator pump guide covers that symptom.

Utica lists these other MGB operating states in the same table:

Separate a retry lockout from a normal wait

Utica calls MGB Err 62 a soft lockout after the maximum number of retries. Its table says it resets after one hour if the alarm’s cause disappears. That explains the wait, but not what prevented ignition.

For ignition trouble, Utica’s MGB procedure checks the ignition cable, connections, grounding and spark circuit. Those are service checks. A retry code alone is not a reason to order a gas valve or ignition control.

The selected entries below are from Utica’s MGB Table 7, Troubleshooting Error Codes. Keep them separate from the StA table above.

Keep the lockout type with the UB95M number

Utica’s UB95M Rev. F guide says a soft lockout alternates 9 and b, and the boiler can start again when the condition clears or times out. A hard lockout flashes E and needs a manual reset after the technician corrects its cause.

For E02, Utica’s troubleshooting table describes ignition failing through five attempts. It splits the investigation into no spark, spark without flame, and a flame with a low signal. Each branch leads to different tests.

These selected UB95M entries come from Utica’s Rev. F control guide:

For E04, Utica says the control still needs a manual reset after power loss, but the earlier error information is lost. Cutting power can therefore leave the repairer with less to work from.

Have the ignition failure traced to its cause

Utica’s September 2022 MAC/MAH installation manual calls 133 ignition failure. This section covers MAH-75, 100, 125 and 165 heating boilers and MAC-115, 150 and 205 combi boilers in that manual package.

Its 133 row directs the technician to the condensate trap, sensing electrode, spark electrode and cable, flue recirculation, grounding, gas orifice and gas pressure. It also includes calibration if necessary. The fault is wider than just a dirty flame sensor.

Utica’s accompanying application guide describes E133 as interruption of gas supply or flame failure. It says that an ineffective reset, or errors that recur regularly, need further investigation. Leave calibration and gas adjustments to the repairer rather than trying to clear 133 through installer settings.