Hayward EcoStar Check System: Warning No Comm
Quick Summary
- "Warning No Comm" means the display and drive are not communicating with each other over the internal data link.
- First step: inspect the data wire between display and drive and re-seat both ends firmly.
- Key diagnostic: enter Diagnostics Menu and navigate to "Drive Rev." If it shows 0.00, replace the drive — it has failed internally.
- On wall-mount display setups, isolate the remote display from the RS485 circuit by connecting the display directly to the pump to determine whether the problem is in the comm cable or in the drive itself.
What "Warning No Comm" Means
The EcoStar display and drive are two separate assemblies that communicate over a low-voltage data connection. The display sends programming inputs to the drive and receives status information back. "Warning No Comm" appears when this communication link breaks — the display and drive can no longer talk to each other.
This can happen when the physical data wire is disconnected or damaged, when the drive itself fails internally (and can no longer respond on the data link), or when remote-mount wall display RS485 wiring has a problem.
Note: "Warning No Comm" is different from the "Bridge Comm Error" you might see on a Hayward automation panel when the pump is powered down as part of daily automation cycling. Bridge Comm Error is expected and harmless. Warning No Comm on the pump display itself is a real communication failure between the display and drive.
Step-by-Step Troubleshooting
Owner-Level Checks
1. Check that nothing physically disrupted the display or wiring
- Was any work done on the pad recently? Equipment moved, wiring rerouted, anything that could have pulled on the display data wire?
- For on-pump displays: look at the back of the display where the harness connects to the pump body. Is the connector fully seated?
- For wall-mount displays: trace the RS485 cable from the wall bracket back to the pump. Look for obvious damage, kinked cable, or pulled-out connector.
Tech-Level Checks
2. Inspect and re-seat the data wire connector
- With power off at the breaker, locate the data wire harness connector at the pump. It is typically a small multi-pin connector that clips or plugs into the drive board.
- Unplug the connector, inspect the contacts for corrosion or bent pins, then re-seat it firmly until it clicks.
- Restore power and check whether the error clears.
3. Check the Drive Rev in Diagnostics
- If the display shows Warning No Comm but is still responsive enough to navigate menus, access the Diagnostics Menu: press Menu repeatedly until "Diagnostic Menu" appears, then press the right arrow to enter.
- Navigate to "Drive Rev." The display will show the drive firmware version — on current units, this should be something like "1.13."
- If Drive Rev shows "0.00": the drive is not communicating with itself on the data bus. This is a definitive sign of drive failure. Replace the drive — data wire and display are not the problem.
- If Drive Rev shows a valid firmware version (not 0.00): the drive is alive. The problem is in the data wire, the connector, or the remote display circuit.
4. For wall-mount displays: isolate the display from the RS485 circuit
The wall-mount display communicates to the drive via RS485 wiring. To determine whether the fault is in that comm cable or in the drive itself:
- Remove the display from its wall bracket.
- Disconnect the RS485 comm cable from the display.
- Bring the display to the pump and remove the display cover plate on the pump body.
- Connect the display directly to the pump's drive wiring harness (bypassing the RS485 cable entirely).
- Restore power and observe whether "Warning No Comm" clears.
- If the error clears with the display connected directly: the RS485 comm cable between wall and pump is the problem. Check cable for damage, verify wiring connections at both the wall bracket RS485 block and the pump RS485 block (both must be correctly numbered and firmly seated), and replace if needed.
- If the error persists with the display connected directly: the problem is in the drive. Check Drive Rev in Diagnostics — if it shows 0.00, replace the drive. If it shows a valid version, the display itself may have failed; try a known-good display.
5. Verify RS485 wiring terminal numbering
- RS485 is a polarity-sensitive protocol. The wires must connect to the correct numbered terminals at both ends. Check the EcoStar installation manual for the correct terminal assignment.
- Reversed RS485 wiring will prevent communication but will not damage the display or drive — correcting the wiring will restore communication immediately.
Frequently Asked Questions
The pump still seems to be running even though it says Warning No Comm. Is it okay?
The drive can continue running its last programmed speed or timer schedule even without communication to the display — it operates from stored programming. However, you cannot change settings or get status information from the display. The warning needs to be resolved to restore full control.
Can the wall-mount display be too far from the pump?
The EcoStar supports wall-mount display runs up to 200 feet with standard RS485 cable. Beyond that distance, signal degradation can cause intermittent comm failures. If your installation is near or beyond the limit, verify cable quality and consider a shorter run or a signal repeater.
I replaced the display and still get Warning No Comm. What now?
If you have confirmed the data wire is good and a new display still shows the error, check Drive Rev in Diagnostics. If it reads 0.00, the drive has failed and needs replacement. A failed drive will prevent any display from establishing communication.
What does "Bridge Comm Error" on the automation panel have to do with Warning No Comm?
Nothing directly — they are different comm links. Bridge Comm Error is the automation panel reporting that it lost its RS485 link to the pump (usually because the pump powered down as part of daily automation cycling). Warning No Comm is the pump's own display reporting it lost its internal data link to the drive. They can occur independently.