CMP DEL Sanitizer Troubleshooting Guide
Looking for CMP DEL specs? See the linked CMP equipment pages for electrical values, replacement parts, and related models. Open the CMP DEL interactive troubleshooter.
CMP DEL Sanitizer Troubleshooting Guide
This CMP DEL sanitizer troubleshooting guide covers manual-backed checks for DEL UV-C 50, DEL AOP 25/40, DEL AOP 50, DEL AOP-S, and DEL Ozone 25/50/100. CMP manuals treat these as supplemental sanitizers, so keep the normal pool residual sanitizer in range while you troubleshoot the UV, ozone, AOP, flow, and lamp-side issues below.
Quick Symptom Table
| Symptom | Applies to | Manual-backed first checks |
|---|---|---|
| Green power indicator is not lit | DEL UV-C 50 | Check source power, breaker status, loose wiring, wiring breaks, and the indicator light before assuming the UV chamber has failed. |
| One or both UV lamps are not lit | DEL UV-C 50 | Reseat lamp connectors, look for water fouling near lamp connections, then evaluate the UV lamp and ballast listed in the manual troubleshooting path. |
| Flow indicator stays on | DEL AOP 25/40, DEL AOP 50 | Confirm actual water flow first. CMP troubleshooting then points to the flow switch and flow-switch relay if flow is adequate. |
| UV-C fault or UV service condition | DEL AOP 25/40, DEL AOP 50 | Use the status indicators to confirm whether the UV-C lamp system is operating normally before replacing lamp parts. |
| System active indicator is off | DEL AOP-S | Confirm the pool system is running and verify at least 5 GPM injector flow. |
| Ozone tubing is yellow, brown, or brittle | DEL AOP-S | Treat deteriorated ozone tubing as a service condition. Replace tubing before leaks or air-draw problems get worse. |
| Ozone module light is not illuminated after startup | DEL Ozone 25/50/100 | Restore power and confirm the ozone module light or lights illuminate during the startup check. |
| Condensation is present in ozone tubing | DEL Ozone 25/50/100 | Wear gloves and eye protection before disconnecting the manifold because the service manual warns that trace nitric acid may be present. |
DEL UV-C 50 Troubleshooting
For the DEL UV-C 50, CMP lists two public-facing problem paths that are useful in the field: the green indicator not lighting and one or both UV lamps not lighting. Start with power because the UV-C 50 manual lists source power, the breaker, loose wiring, wiring breaks, and the indicator itself before lamp replacement. The unit supports 120/240 VAC, draws 0.8A at 120V or 0.4A at 240V, and is listed at 96W, so a power-side problem should be ruled out before replacing UV parts.
If the UV lamps do not light, CMP's troubleshooting path moves to the lamp connectors, water fouling at lamp connections, a failed UV lamp, and a failed ballast. The same manual lists UV lamp 9-1421-01 and quartz tube assembly 9-1416-01 as standard service parts. It also calls for quartz tube cleaning every 6 months and UV lamp replacement every 18 months.
DEL AOP 25/40 and DEL AOP 50 Troubleshooting
The AOP units combine ozone and UV-C treatment, so separate a flow problem from a UV or ozone service condition. For AOP 25/40, the equipment data from CMP manuals lists a 20 GPM recommended minimum flow, with NSF-tested maximum values of 30 GPM for AOP 25 and 40 GPM for AOP 40. For DEL AOP 50, the manual-backed maximum flow value is 50 GPM.
| Check | Manual-supported detail | What it rules out |
|---|---|---|
| Water flow | AOP 25/40 lists 20 GPM recommended minimum flow; AOP 50 lists 50 GPM maximum flow. | Insufficient flow before flow-switch diagnosis. |
| Flow switch / relay | CMP troubleshooting lists flow switch failure and relay failure after insufficient flow. | Electrical flow-signal failure after real flow is confirmed. |
| UV lamp service interval | AOP 50 lists UV lamp kit 9-1266-01 with an 18-month maintenance interval. | A lamp-age issue versus a flow problem. |
| Installation position | CMP AOP pages place the unit in the pool main return line after pump, filter, heater, and cleaner equipment. | Plumbing layouts that do not match the manual installation path. |
DEL AOP-S Troubleshooting
For DEL AOP-S, CMP's manual-backed checks are mostly flow and service-item checks. The model data lists a 5 to 20 GPM water flow range and specifically references minimum 5 GPM injector flow for active operation. If the system active indicator is off, confirm that the pool system is running and that injector flow is at least 5 GPM before treating the UV lamp or ozone module as the likely cause.
The same manual-backed data flags yellow, brown, or brittle ozone tubing as a service condition. DEL AOP-S service parts include UV lamp replacement assembly 9-1100-01 and ozone module 9-1636-01.
DEL Ozone 25/50/100 Service Checks
The DEL Ozone 25/50/100 service manual focuses on ozone module subassembly service. During startup after service, CMP says to restore power and check that the ozone module light or lights are illuminated. The same service instructions warn that trace nitric acid may be present in the tubing when disconnecting the manifold, so gloves and eye protection are part of the manual-backed service procedure.
| Model | Manual-backed electrical values | Service note |
|---|---|---|
| DEL Ozone 25 | 120/240V, 50/60 Hz, 0.10A | One ozone module in the service subassembly. |
| DEL Ozone 50 | 120/240V, 50/60 Hz, 0.24A | Two ozone modules in the service subassembly. |
| DEL Ozone 100 | 120/240V, 50/60 Hz, 0.31A | Three ozone modules in the service subassembly. |
Parts To Check Before The Service Call
- DEL UV-C 50: UV lamp
9-1421-01and quartz tube assembly9-1416-01. - DEL AOP 25/40: UV lamps
9-1626-02and9-1626-01, listed as two lamps per unit in the manual-backed data. - DEL AOP 50: UV lamp kit
9-1266-01. - DEL AOP-S: UV lamp replacement assembly
9-1100-01and ozone module9-1636-01. - DEL Ozone 25/50/100: ozone module subassembly, ozone outlet manifold, and tubing clamp.
CMP DEL Sanitizer FAQ
Does a CMP DEL sanitizer replace chlorine?
No. CMP manual language treats UV, ozone, and AOP units as supplemental sanitation. The DEL UV-C 50 manual specifically says the product should be used with registered or approved disinfection chemicals.
What should I check first when a DEL UV-C 50 lamp is out?
Use CMP's manual order: check lamp connector seating and water fouling near lamp connections, then evaluate the UV lamp and ballast.
What flow should I verify on DEL AOP-S?
The manual-backed DEL AOP-S data lists a 5 to 20 GPM water flow range and references minimum 5 GPM injector flow for active operation.
Is condensation in DEL Ozone tubing normal to handle bare-handed?
No. CMP's DEL Ozone service instructions warn that trace nitric acid may be present in the tubing and call for gloves and eye protection before manifold disconnection.