What does this dehumidifier annual checklist cover?

15 items across 5 sections, covering lockout and electrical, deep clean, refrigeration or desiccant, controls and airflow, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.

Who should run this inspection?

The HVAC service tech on the annual service.

When in the schedule should this walk happen?

Once a year before the humid season, sized around the coil cleaning and the refrigerant or desiccant check the quarterly round can't reach.

Why do these items ask for a photo?

9 of the 15 items call for photo evidence, 12 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.

What most often fails a dehumidifier annual inspection?

Coils cleaned but the drain pump check valve never tested, so it back-siphons and the pan floods between visits. Desiccant unit's reactivation heater weak and never checked, so the wheel isn't drying and capacity has quietly collapsed.

Can I use this checklist in RTI?

Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Free checklist

Dehumidifier annual maintenance checklist

The annual dehumidifier service is the deep pass: the measurements, cleanings and tests a quarterly round doesn't reach. This checklist keeps the full service on record with the photos that make it defensible later. Work is commonly verified against IMC, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.

Start free with this checklist Download as PDF

The checklist

Every item, and the photo evidence it needs

The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.

Lockout and electrical

Service history and last year's readings reviewed first
Previous amps, airflow, humidistat offset and any refrigerant or wheel work looked over so this year's figures have a baseline to be compared against.
No photo
Every power source feeding the unit locked and tagged
Main feed and any separate reheat, reactivation heater or control circuit locked, tagged and tried. Test runs: panels on, tools clear, locks off by their owner, re-locked before hands go back in.
Electrical terminations checked for tightness and heat
Terminals torque-verified or resistance-measured, re-torqued only where found loose, no heat discoloration on lugs, contactors or wiring insulation.

Deep clean

Coils cleaned and airflow restored
Both coils cleaned with the appropriate cleaner and rinsed, fins combed, so heat exchange and the moisture-removal rate come back to where they belong.
No photo
Condensate pan, trap and pump serviced
Pan pulled and cleaned, trap cleared, condensate pump float and check valve tested, drain line flushed clear of slime.
Blower wheel, motor and bearings cleaned and checked
Wheel cleaned on both blade faces, motor cooling openings clear, shaft checked for play, bearings greased to the manufacturer's schedule or noted as sealed.

Refrigeration or desiccant

Desiccant wheel media and seals serviced on wheel units
Wheel units only: media cleaned by the manufacturer's method, checked for chips or contamination, perimeter and divider seals inspected and renewed where worn.
No photo
Refrigeration circuit or desiccant reactivation checked
On a refrigerant unit, suction and head behavior and superheat observed for a low charge or restriction; on a desiccant unit, the reactivation heater, purge airflow and wheel drive checked so the desiccant is actually being dried and regenerated.
Refrigerant work left to a certified refrigerant technician
Refrigerant units only: gauges, leak checks and any charge change handled by a certified refrigerant technician, amounts added or recovered entered on the refrigerant log.
No photo

Controls and airflow

Humidistat calibrated and airflow measured
Humidistat compared against a reference hygrometer and adjusted, airflow measured against the unit's rating, belt or blower checked so the design air is actually moving.
Motor and heater current read against the nameplate
Compressor or wheel drive, blower and any heater current read under the site's energized-work procedure and its PPE, within the nameplate and against last year's reading.
Unit safety trip tested by the manufacturer's method
Building operator told first. A safety the manufacturer allows testing, such as the pan overflow float, tripped on a running unit; it stops, shows the fault and resets. Nothing jumpered.
Humidity and alarm points checked at the building controls
Where the unit reports to building controls, the humidity reading matches the local one and the tripped safety showed as an alarm at the front end.
No photo

Return to service

Unit closed up and locks removed by whoever hung them
Panels, filters and guards refitted, tools out of the cabinet, each lock removed by its owner, unit restarted and left in auto on its humidistat.
Service readings filed on the unit record for next year
Amps, airflow, humidistat offset, wheel or refrigerant findings and deferred repairs entered against the unit so next year's service starts from this one.
No photo

What usually sends this back

The failures are almost always the evidence, not the work

Coils cleaned but the drain pump check valve never tested, so it back-siphons and the pan floods between visits.
Desiccant unit's reactivation heater weak and never checked, so the wheel isn't drying and capacity has quietly collapsed.

Verified against

IMC (mechanical code)

Common questions

6 answers

What does this dehumidifier annual checklist cover?: 15 items across 5 sections, covering lockout and electrical, deep clean, refrigeration or desiccant, controls and airflow, and more. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
Who should run this inspection?: The HVAC service tech on the annual service.
When in the schedule should this walk happen?: Once a year before the humid season, sized around the coil cleaning and the refrigerant or desiccant check the quarterly round can't reach.
Why do these items ask for a photo?: 9 of the 15 items call for photo evidence, 12 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
What most often fails a dehumidifier annual inspection?: Coils cleaned but the drain pump check valve never tested, so it back-siphons and the pan floods between visits. Desiccant unit's reactivation heater weak and never checked, so the wheel isn't drying and capacity has quietly collapsed.
Can I use this checklist in RTI?: Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Related checklists

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Run it with the Photo Gate

A checklist nobody can submit half-finished

Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 12 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.