Timer times out too long or too short
The timer switches, but at the wrong time — the delay is much longer or shorter than it should be, throwing out the sequence.
Safety first
A wrong delay can start or stop equipment earlier/later than expected. Make sure that mistiming can't create a hazard while you adjust it.
Isolate, lock out / tag out, and prove dead before working unless a live test is specifically required, authorised, and carried out under proper supervision. Always follow local regulations, your site procedures, and the equipment manufacturer's documentation.
Full detail — causes, the why, and common mistakes.
Likely causes
Ranked from most to least likely.
- 1
Wrong time setting or range multiplier
Most likelyThe set value or the range/multiplier (seconds vs minutes vs ×10) is wrong, giving a delay far off target.
- 2
Wrong units misread
#2The scale was read in the wrong units (e.g. minutes set where seconds intended).
- 3
Drifting/aging analogue timer
#3An older analogue timer can drift from its set value over time.
- 4
Trigger arriving early/late
Least likelyThe timing looks wrong because the trigger that starts it isn't arriving when expected.
Reports are saved on this device to reflect what you actually find.
Testing sequence
Work through one test at a time. Expected reading and what each result means.
Read the set value and the range/multiplier and compare to the intended delay.
Set value and range produce the intended delay.
Setting looks right — time a full cycle to measure the actual delay.
Wrong value/range/units — correct it.
View all expected readings at once
Fault-finding flowchart
The same logic as a decision tree.
- 1start
Timer time wrong
→ step 2 - 2decision
Do the set value and range/units match the intended delay?
Yes→ step 3No→ step 4 - 3decision
Does the measured delay match the set value?
Yes→ step 5No→ step 6 - 4result
Wrong value/range/units — correct it.
- 5decision
Does the trigger arrive at the correct point?
Yes→ step 7No→ step 8 - 6result
Analogue drift — recalibrate or replace the timer.
- 7result
Re-verify the setting.
- 8result
Trigger early/late — fix the signal that starts the timer.
Common mistakes apprentices make
- Setting minutes where seconds were intended (or vice versa).
- Ignoring the range multiplier.
- Assuming the timer when the trigger arrives at the wrong time.
- Trusting an aged analogue timer that has drifted.
When to stop & escalate
If the required timing is part of a documented sequence and isn't clear, confirm the intended delay against the control description before changing it.
If you're past your competence, authorisation, or the safe limits of the job — stop and hand it on. There's no fault worth getting hurt over.
Related faults
Timer relay not switching its output
A timer relay is powered but its output contact never changes state — the delayed action (start, changeover, stop) never happens, or it switches at the wrong time.
Timer resets part-way through timing
The timer starts but resets before it finishes, so it never completes — the delayed action keeps getting cancelled and never happens.
Star-delta starter not transitioning to delta
A star-delta (wye-delta) starter starts the motor in star but never switches to delta — the motor runs weak/slow, or trips, because it stays in the starting connection.